diff --git a/src/bin/expect_tests/contract_tests.ml b/src/bin/expect_tests/contract_tests.ml
index c1ec32c6e..bacbfc8e2 100644
--- a/src/bin/expect_tests/contract_tests.ml
+++ b/src/bin/expect_tests/contract_tests.ml
@@ -125,7 +125,7 @@ let%expect_test _ =
                      CDR ;
                      DIP { DIP 7 { DUP } ;
                            DIG 7 ;
-                           SOURCE ;
+                           SENDER ;
                            PAIR ;
                            SOME ;
                            DIP { DIP { DUP } ; SWAP ; CAR ; CDR } } ;
@@ -162,7 +162,7 @@ let%expect_test _ =
                      IF_NONE { PUSH string "MAP FIND" ; FAILWITH } {} ;
                      DUP ;
                      CAR ;
-                     SOURCE ;
+                     SENDER ;
                      SWAP ;
                      COMPARE ;
                      NEQ ;
@@ -207,7 +207,7 @@ let%expect_test _ =
                      CAR ;
                      DIP { DIP 2 { DUP } ; DIG 2 ; CDR } ;
                      MUL ;
-                     SOURCE ;
+                     SENDER ;
                      CONTRACT unit ;
                      IF_NONE { PUSH string "bad address for get_contract" ; FAILWITH } {} ;
                      DIP { DUP } ;
@@ -249,7 +249,7 @@ let%expect_test _ =
                  IF_NONE { PUSH string "MAP FIND" ; FAILWITH } {} ;
                  DUP ;
                  CAR ;
-                 SOURCE ;
+                 SENDER ;
                  SWAP ;
                  COMPARE ;
                  NEQ ;
@@ -1008,7 +1008,7 @@ let%expect_test _ =
                        DIP { DIP { DUP } ; SWAP ; CDR ; CAR ; CDR ; CDR } ;
                        PAIR } ;
                  PAIR ;
-                 DIP { DIP { DUP } ; SWAP ; CDR ; CDR ; PUSH bool True ; SOURCE ; UPDATE } ;
+                 DIP { DIP { DUP } ; SWAP ; CDR ; CDR ; PUSH bool True ; SENDER ; UPDATE } ;
                  PAIR ;
                  NIL operation ;
                  PAIR ;
diff --git a/src/main/run/of_michelson.ml b/src/main/run/of_michelson.ml
index 4a9b7e1c3..6e8733e0e 100644
--- a/src/main/run/of_michelson.ml
+++ b/src/main/run/of_michelson.ml
@@ -75,7 +75,7 @@ let make_dry_run_options (opts : dry_run_options) : options result =
       match Memory_proto_alpha.Protocol.Alpha_context.Timestamp.of_notation st with
         | Some t -> ok (Some t)
         | None -> simple_fail ("\""^st^"\" is a bad timestamp notation") in
-  ok @@ make_options ?predecessor_timestamp:predecessor_timestamp ~amount ?source:sender ?payer:source ()
+  ok @@ make_options ?predecessor_timestamp:predecessor_timestamp ~amount ?sender ?source ()
 
 let ex_value_ty_to_michelson (v : ex_typed_value) : Michelson.t result =
   let (Ex_typed_value (value , ty)) = v in
diff --git a/src/test/coase_tests.ml b/src/test/coase_tests.ml
index 57e55b495..be36603c7 100644
--- a/src/test/coase_tests.ml
+++ b/src/test/coase_tests.ml
@@ -90,11 +90,11 @@ let (first_owner , first_contract) =
   let kt = id.implicit_contract in
   Protocol.Alpha_context.Contract.to_b58check kt , kt
 
-let second_owner =
+let (second_owner , second_contract) =
   let open Proto_alpha_utils.Memory_proto_alpha in
   let id = List.nth dummy_environment.identities 1 in
   let kt = id.implicit_contract in
-  Protocol.Alpha_context.Contract.to_b58check kt
+  Protocol.Alpha_context.Contract.to_b58check kt , kt
 
 let basic a b cards next_id =
   let card_patterns = List.map card_pattern_ez [
@@ -127,13 +127,13 @@ let buy () =
       let%bind amount =
         trace_option (simple_error "getting amount for run") @@
         Memory_proto_alpha.Protocol.Alpha_context.Tez.of_mutez @@ Int64.of_int 10000000000 in
-      let options = Proto_alpha_utils.Memory_proto_alpha.make_options ~amount () in
+      let options = Proto_alpha_utils.Memory_proto_alpha.make_options ~amount ~sender:second_contract () in
       expect_eq_n_pos_small ~options program "buy_single" make_input make_expected in
     let%bind () =
       let%bind amount =
         trace_option (simple_error "getting amount for run") @@
         Memory_proto_alpha.Protocol.Alpha_context.Tez.of_mutez @@ Int64.of_int 0 in
-      let options = Proto_alpha_utils.Memory_proto_alpha.make_options ~amount () in
+      let options = Proto_alpha_utils.Memory_proto_alpha.make_options ~amount ~sender:second_contract () in
       trace_strong (simple_error "could buy without money") @@
       Assert.assert_fail
       @@ expect_eq_n_pos_small ~options program "buy_single" make_input make_expected in
@@ -166,13 +166,13 @@ let dispatch_buy () =
       let%bind amount =
         trace_option (simple_error "getting amount for run") @@
         Memory_proto_alpha.Protocol.Alpha_context.Tez.of_mutez @@ Int64.of_int 10000000000 in
-      let options = Proto_alpha_utils.Memory_proto_alpha.make_options ~amount () in
+      let options = Proto_alpha_utils.Memory_proto_alpha.make_options ~amount ~sender:second_contract () in
       expect_eq_n_pos_small ~options program "main" make_input make_expected in
     let%bind () =
       let%bind amount =
         trace_option (simple_error "getting amount for run") @@
         Memory_proto_alpha.Protocol.Alpha_context.Tez.of_mutez @@ Int64.of_int 0 in
-      let options = Proto_alpha_utils.Memory_proto_alpha.make_options ~amount () in
+      let options = Proto_alpha_utils.Memory_proto_alpha.make_options ~amount ~sender:second_contract () in
       trace_strong (simple_error "could buy without money") @@
       Assert.assert_fail
       @@ expect_eq_n_pos_small ~options program "buy_single" make_input make_expected in
@@ -204,8 +204,8 @@ let transfer () =
     in
     let%bind () =
       let amount = Memory_proto_alpha.Protocol.Alpha_context.Tez.zero in
-      let payer = first_contract in
-      let options = Proto_alpha_utils.Memory_proto_alpha.make_options ~amount ~payer () in
+      let sender = first_contract in
+      let options = Proto_alpha_utils.Memory_proto_alpha.make_options ~amount ~sender () in
       expect_eq_n_strict_pos_small ~options program "transfer_single" make_input make_expected in
     ok ()
   in
@@ -234,8 +234,8 @@ let sell () =
     in
     let%bind () =
       let amount = Memory_proto_alpha.Protocol.Alpha_context.Tez.zero in
-      let payer = first_contract in
-      let options = Proto_alpha_utils.Memory_proto_alpha.make_options ~amount ~payer () in
+      let sender = first_contract in
+      let options = Proto_alpha_utils.Memory_proto_alpha.make_options ~amount ~sender () in
       expect_n_strict_pos_small ~options program "sell_single" make_input make_expecter in
     ok ()
   in
diff --git a/src/test/contracts/coase.ligo b/src/test/contracts/coase.ligo
index fd870b7a8..5f5b00644 100644
--- a/src/test/contracts/coase.ligo
+++ b/src/test/contracts/coase.ligo
@@ -48,7 +48,7 @@ function transfer_single (const action : action_transfer_single;
                           const s : storage) : return is block {
     const cards : cards = s.cards;
     const card : card = get_force (action.card_to_transfer, cards);
-    if card.card_owner =/= source then
+    if card.card_owner =/= sender then
       failwith ("This card doesn't belong to you")
     else skip;
     card.card_owner := action.destination;
@@ -61,7 +61,7 @@ function sell_single (const action : action_sell_single;
                       const s : storage) : return is
   block {
     const card : card = get_force (action.card_to_sell, s.cards);
-    if card.card_owner =/= source
+    if card.card_owner =/= sender
     then failwith ("This card doesn't belong to you")
     else skip;
     const card_pattern : card_pattern =
@@ -74,7 +74,7 @@ function sell_single (const action : action_sell_single;
     remove action.card_to_sell from map cards;
     s.cards := cards;
     const price : tez = card_pattern.coefficient * card_pattern.quantity;
-    const receiver : contract (unit) = get_contract (source);
+    const receiver : contract (unit) = get_contract (sender);
     const op : operation = transaction (unit, price, receiver);
     const operations : list (operation) = list [op]
   } with (operations, s)
@@ -98,7 +98,7 @@ function buy_single (const action : action_buy_single;
     // Add card
     const cards : cards = s.cards;
     cards[s.next_id] := record [
-      card_owner   = source;
+      card_owner   = sender;
       card_pattern = action.card_to_buy
     ];
     s.cards := cards;
diff --git a/src/test/contracts/get_contract.ligo b/src/test/contracts/get_contract.ligo
index cb203c840..8ace2277d 100644
--- a/src/test/contracts/get_contract.ligo
+++ b/src/test/contracts/get_contract.ligo
@@ -3,7 +3,7 @@ type return is list (operation) * storage
 
 function cb (const s : storage) : return is
   block {
-    const c : contract (unit) = get_contract (source)
+    const c : contract(unit) = get_contract(sender)
   }
   with (list [transaction(unit, 0mutez, c)], s)
 
@@ -11,7 +11,7 @@ function cb (const s : storage) : return is
 function cbo (const s : unit) : return is
   block {
     const c : contract (unit) =
-      case (get_contract_opt (source) : option (contract (unit))) of
+      case (get_contract_opt(sender) : option(contract(unit))) of
         Some (c) -> c
       | None -> (failwith ("contract not found") : contract (unit))
       end
diff --git a/src/test/contracts/vote.mligo b/src/test/contracts/vote.mligo
index 414b72300..a32f54fa4 100644
--- a/src/test/contracts/vote.mligo
+++ b/src/test/contracts/vote.mligo
@@ -35,7 +35,7 @@ let init (init_params_s : init_action * storage) =
 let vote (ps : string * storage) =
   let now = Current.time in
   (* let _ = assert (now >= ps.1.beginning_time && ps.1.finish_time > now) in *)
-  let addr = Current.source in
+  let addr = Current.sender in
   (* let _ = assert (not Set.mem addr ps.1.voters) in *)
   let x = Map.find ps.0 ps.1.candidates in
   (
diff --git a/src/test/hash_lock_tests.ml b/src/test/hash_lock_tests.ml
index bff1e8219..7bfe77c88 100644
--- a/src/test/hash_lock_tests.ml
+++ b/src/test/hash_lock_tests.ml
@@ -78,7 +78,7 @@ let commit () =
   let options =
     Proto_alpha_utils.Memory_proto_alpha.make_options
       ~predecessor_timestamp
-      ~payer:first_contract
+      ~sender:first_contract
       ()
   in
   expect_eq ~options program "commit"
@@ -127,7 +127,7 @@ let reveal_young_commit () =
   let options =
     Proto_alpha_utils.Memory_proto_alpha.make_options
       ~predecessor_timestamp
-      ~payer:first_contract
+      ~sender:first_contract
       ()
   in
   expect_string_failwith ~options program "reveal"
@@ -159,7 +159,7 @@ let reveal_breaks_commit () =
   let options =
     Proto_alpha_utils.Memory_proto_alpha.make_options
       ~predecessor_timestamp
-      ~payer:first_contract
+      ~sender:first_contract
       ()
   in
   expect_string_failwith ~options program "reveal"
@@ -191,7 +191,7 @@ let reveal_wrong_commit () =
   let options =
     Proto_alpha_utils.Memory_proto_alpha.make_options
       ~predecessor_timestamp
-      ~payer:first_contract
+      ~sender:first_contract
       ()
   in
   expect_string_failwith ~options program "reveal"
@@ -223,7 +223,7 @@ let reveal_no_reuse () =
   let options =
     Proto_alpha_utils.Memory_proto_alpha.make_options
       ~predecessor_timestamp
-      ~payer:first_contract
+      ~sender:first_contract
       ()
   in
   expect_string_failwith ~options program "reveal"
@@ -256,7 +256,7 @@ let reveal () =
   let options =
     Proto_alpha_utils.Memory_proto_alpha.make_options
       ~predecessor_timestamp
-      ~payer:first_contract
+      ~sender:first_contract
       ()
   in
   expect_eq ~options program "reveal"
diff --git a/src/test/id_tests.ml b/src/test/id_tests.ml
index dfe5be581..db8b78960 100644
--- a/src/test/id_tests.ml
+++ b/src/test/id_tests.ml
@@ -48,7 +48,7 @@ let buy_id () =
   in
   let new_addr = first_owner in
   let options = Proto_alpha_utils.Memory_proto_alpha.make_options
-      ~payer:first_contract
+      ~sender:first_contract
       ~amount:(Memory_proto_alpha.Protocol.Alpha_context.Tez.one) ()
   in
   let new_website = e_bytes_string "ligolang.org" in
@@ -81,7 +81,7 @@ let buy_id_sender_addr () =
   in
   let new_addr = first_owner in
   let options = Proto_alpha_utils.Memory_proto_alpha.make_options
-      ~payer:first_contract
+      ~sender:first_contract
       ~amount:(Memory_proto_alpha.Protocol.Alpha_context.Tez.one) ()
   in
   let new_website = e_bytes_string "ligolang.org" in
@@ -115,7 +115,7 @@ let buy_id_wrong_amount () =
   in
   let new_addr = first_owner in
   let options = Proto_alpha_utils.Memory_proto_alpha.make_options
-      ~payer:first_contract
+      ~sender:first_contract
       ~amount:(Memory_proto_alpha.Protocol.Alpha_context.Tez.fifty_cents) ()
   in
   let param = e_pair owner_website (e_some (e_address new_addr)) in
@@ -134,7 +134,7 @@ let update_details_owner () =
   in
   let new_addr = first_owner in
   let options = Proto_alpha_utils.Memory_proto_alpha.make_options
-      ~payer:first_contract
+      ~sender:first_contract
       ~amount:(Memory_proto_alpha.Protocol.Alpha_context.Tez.zero) 
       ()
   in
@@ -175,7 +175,7 @@ let update_details_controller () =
   in
   let new_addr = first_owner in
   let options = Proto_alpha_utils.Memory_proto_alpha.make_options
-      ~payer:first_contract
+      ~sender:first_contract
       ~amount:(Memory_proto_alpha.Protocol.Alpha_context.Tez.zero)
       ()
   in
@@ -217,7 +217,7 @@ let update_details_nonexistent () =
   in
   let new_addr = first_owner in
   let options = Proto_alpha_utils.Memory_proto_alpha.make_options
-      ~payer:first_contract
+      ~sender:first_contract
       ~amount:(Memory_proto_alpha.Protocol.Alpha_context.Tez.zero)
       ()
   in
@@ -284,7 +284,7 @@ let update_details_unchanged () =
   in
   let new_addr = first_owner in
   let options = Proto_alpha_utils.Memory_proto_alpha.make_options
-      ~payer:first_contract
+      ~sender:first_contract
       ~amount:(Memory_proto_alpha.Protocol.Alpha_context.Tez.zero)
       ()
   in
@@ -316,7 +316,7 @@ let update_owner () =
   in
   let new_addr = first_owner in
   let options = Proto_alpha_utils.Memory_proto_alpha.make_options
-      ~payer:first_contract
+      ~sender:first_contract
       ~amount:(Memory_proto_alpha.Protocol.Alpha_context.Tez.zero)
       ()
   in
@@ -355,7 +355,7 @@ let update_owner_nonexistent () =
   in
   let new_addr = first_owner in
   let options = Proto_alpha_utils.Memory_proto_alpha.make_options
-      ~payer:first_contract
+      ~sender:first_contract
       ~amount:(Memory_proto_alpha.Protocol.Alpha_context.Tez.zero)
       ()
   in
@@ -386,7 +386,7 @@ let update_owner_wrong_addr () =
   in
   let new_addr = first_owner in
   let options = Proto_alpha_utils.Memory_proto_alpha.make_options
-      ~payer:first_contract
+      ~sender:first_contract
       ~amount:(Memory_proto_alpha.Protocol.Alpha_context.Tez.zero)
       ()
   in
@@ -416,7 +416,7 @@ let skip () =
   in
   let new_addr = first_owner in
   let options = Proto_alpha_utils.Memory_proto_alpha.make_options
-      ~payer:first_contract
+      ~sender:first_contract
       ~amount:(Memory_proto_alpha.Protocol.Alpha_context.Tez.one) ()
   in
   let new_website = e_bytes_string "ligolang.org" in
@@ -450,7 +450,7 @@ let skip_wrong_amount () =
   in
   let new_addr = first_owner in
   let options = Proto_alpha_utils.Memory_proto_alpha.make_options
-      ~payer:first_contract
+      ~sender:first_contract
       ~amount:(Memory_proto_alpha.Protocol.Alpha_context.Tez.fifty_cents) ()
   in
   let new_website = e_bytes_string "ligolang.org" in
diff --git a/src/test/multisig_v2_tests.ml b/src/test/multisig_v2_tests.ml
index e21736586..0ed619c1d 100644
--- a/src/test/multisig_v2_tests.ml
+++ b/src/test/multisig_v2_tests.ml
@@ -73,8 +73,8 @@ let wrong_addr () =
     id_counter_list = [1,0 ; 2,0] ;
     msg_store_list = []
   } in
-  let source = contract 3 in
-  let options = Proto_alpha_utils.Memory_proto_alpha.make_options ~source () in
+  let sender = contract 3 in
+  let options = Proto_alpha_utils.Memory_proto_alpha.make_options ~sender () in
   let%bind () =
     let exp_failwith = "Unauthorized address" in
     expect_string_failwith ~options program "main"
@@ -89,8 +89,8 @@ let message_size_exceeded () =
     id_counter_list = [1,0] ;
     msg_store_list = []
   } in
-  let source = contract 1 in
-  let options = Proto_alpha_utils.Memory_proto_alpha.make_options ~source () in
+  let sender = contract 1 in
+  let options = Proto_alpha_utils.Memory_proto_alpha.make_options ~sender () in
   let%bind () =
     let exp_failwith = "Message size exceed maximum limit" in
     expect_string_failwith ~options program "main"
@@ -107,8 +107,8 @@ let maximum_number_of_proposal () =
     id_counter_list = [1,1] ;
     msg_store_list = [(bytes1, e_set [e_address@@ addr 1])]
   } in
-  let source = contract 1 in
-  let options = Proto_alpha_utils.Memory_proto_alpha.make_options ~source () in
+  let sender = contract 1 in
+  let options = Proto_alpha_utils.Memory_proto_alpha.make_options ~sender () in
   let%bind () =
     let exp_failwith = "Maximum number of proposal reached" in
     expect_string_failwith ~options program "main"
@@ -126,8 +126,8 @@ let send_already_accounted () =
     msg_store_list = [(bytes, e_set [e_address@@ addr 1])]
   } in
   let options =
-    let source = contract 1 in
-    Proto_alpha_utils.Memory_proto_alpha.make_options ~source () in
+    let sender = contract 1 in
+    Proto_alpha_utils.Memory_proto_alpha.make_options ~sender () in
   expect_eq ~options program "main"
     (e_pair (send_param empty_message) init_storage) (e_pair empty_op_list init_storage)
 
@@ -147,8 +147,8 @@ let send_never_accounted () =
     msg_store_list = [(bytes, e_set [e_address@@ addr 1])] ;
   } in
   let options =
-    let source = contract 1 in
-    Proto_alpha_utils.Memory_proto_alpha.make_options ~source () in
+    let sender = contract 1 in
+    Proto_alpha_utils.Memory_proto_alpha.make_options ~sender () in
   expect_eq ~options program "main"
     (e_pair (send_param empty_message) init_storage) (e_pair empty_op_list final_storage)
 
@@ -168,8 +168,8 @@ let withdraw_already_accounted_one () =
     id_counter_list = [1,0 ; 2,0] ;
     msg_store_list = [] } in
   let options =
-    let source = contract 1 in
-    Proto_alpha_utils.Memory_proto_alpha.make_options ~source () in
+    let sender = contract 1 in
+    Proto_alpha_utils.Memory_proto_alpha.make_options ~sender () in
   expect_eq ~options program "main"
     (e_pair param init_storage) (e_pair empty_op_list final_storage)
 
@@ -189,8 +189,8 @@ let withdraw_already_accounted_two () =
     id_counter_list = [1,0 ; 2,1] ;
     msg_store_list = [(bytes, e_set [e_address@@ addr 2])] } in
   let options =
-    let source = contract 1 in
-    Proto_alpha_utils.Memory_proto_alpha.make_options ~source () in
+    let sender = contract 1 in
+    Proto_alpha_utils.Memory_proto_alpha.make_options ~sender () in
   expect_eq ~options program "main"
     (e_pair param init_storage) (e_pair empty_op_list final_storage)
 
@@ -212,8 +212,8 @@ let counters_reset () =
     id_counter_list = [1,0 ; 2,0 ; 3,0] ;
     msg_store_list = [] } in
   let options =
-    let source = contract 3 in
-    Proto_alpha_utils.Memory_proto_alpha.make_options ~source () in
+    let sender = contract 3 in
+    Proto_alpha_utils.Memory_proto_alpha.make_options ~sender () in
   expect_eq ~options program "main"
     (e_pair param init_storage) (e_pair empty_op_list final_storage)
 
@@ -227,8 +227,8 @@ let withdraw_never_accounted () =
     msg_store_list = [] ;
   } in
   let options =
-    let source = contract 1 in
-    Proto_alpha_utils.Memory_proto_alpha.make_options ~source () in
+    let sender = contract 1 in
+    Proto_alpha_utils.Memory_proto_alpha.make_options ~sender () in
   expect_eq ~options program "main"
     (e_pair param init_storage) (e_pair empty_op_list init_storage)
 
@@ -243,8 +243,8 @@ let succeeded_storing () =
     msg_store_list = [(bytes, e_typed_set [] t_address)] ;
   } in
   let options =
-    let source = contract 1 in
-    Proto_alpha_utils.Memory_proto_alpha.make_options ~source () in
+    let sender = contract 1 in
+    Proto_alpha_utils.Memory_proto_alpha.make_options ~sender () in
   let%bind () = expect_eq_n_trace_aux ~options [1;2] program "main"
       (fun th ->
         let init_storage = storage (init_storage th) in
diff --git a/src/test/replaceable_id_tests.ml b/src/test/replaceable_id_tests.ml
index 6bf09e95a..54d7d1a64 100644
--- a/src/test/replaceable_id_tests.ml
+++ b/src/test/replaceable_id_tests.ml
@@ -44,8 +44,8 @@ let change_addr_success () =
   let init_storage = storage 1 in
   let param = entry_change_addr 2 in
   let options =
-    let source = contract 1 in
-    Proto_alpha_utils.Memory_proto_alpha.make_options ~source () in
+    let sender = contract 1 in
+    Proto_alpha_utils.Memory_proto_alpha.make_options ~sender () in
   expect_eq ~options program "main"
     (e_pair param init_storage) (e_pair empty_op_list (storage 2))
 
@@ -54,8 +54,8 @@ let change_addr_fail () =
   let init_storage = storage 1 in
   let param = entry_change_addr 2 in
   let options =
-    let source = contract 3 in
-    Proto_alpha_utils.Memory_proto_alpha.make_options ~source () in
+    let sender = contract 3 in
+    Proto_alpha_utils.Memory_proto_alpha.make_options ~sender () in
   let exp_failwith = "Unauthorized sender" in
   expect_string_failwith ~options program "main"
     (e_pair param init_storage) exp_failwith
@@ -65,8 +65,8 @@ let pass_message_success () =
   let init_storage = storage 1 in
   let param = entry_pass_message in
   let options =
-    let source = contract 1 in
-    Proto_alpha_utils.Memory_proto_alpha.make_options ~source () in
+    let sender = contract 1 in
+    Proto_alpha_utils.Memory_proto_alpha.make_options ~sender () in
   expect_eq ~options program "main"
     (e_pair param init_storage) (e_pair empty_op_list init_storage)
 
@@ -75,8 +75,8 @@ let pass_message_fail () =
   let init_storage = storage 1 in
   let param = entry_pass_message in
   let options =
-    let source = contract 2 in
-    Proto_alpha_utils.Memory_proto_alpha.make_options ~source () in
+    let sender = contract 2 in
+    Proto_alpha_utils.Memory_proto_alpha.make_options ~sender () in
   let exp_failwith = "Unauthorized sender" in
   expect_string_failwith ~options program "main"
     (e_pair param init_storage) exp_failwith
diff --git a/vendors/ligo-utils/proto-alpha-utils/x_memory_proto_alpha.ml b/vendors/ligo-utils/proto-alpha-utils/x_memory_proto_alpha.ml
index c613c86a4..a8f5aa468 100644
--- a/vendors/ligo-utils/proto-alpha-utils/x_memory_proto_alpha.ml
+++ b/vendors/ligo-utils/proto-alpha-utils/x_memory_proto_alpha.ml
@@ -1067,9 +1067,9 @@ type options = {
 let make_options
     ?(tezos_context = dummy_environment.tezos_context)
     ?(predecessor_timestamp = dummy_environment.tezos_context.predecessor_timestamp)
-    ?(source = (List.nth dummy_environment.identities 0).implicit_contract)
+    ?(sender = (List.nth dummy_environment.identities 0).implicit_contract)
     ?(self = (List.nth dummy_environment.identities 0).implicit_contract)
-    ?(payer = (List.nth dummy_environment.identities 1).implicit_contract)
+    ?(source = (List.nth dummy_environment.identities 1).implicit_contract)
     ?(amount = Alpha_context.Tez.one)
     ?(chain_id = Environment.Chain_id.zero)
     ()
@@ -1077,9 +1077,10 @@ let make_options
   let tezos_context = { tezos_context with predecessor_timestamp } in
   {
     tezos_context ;
-    source ;
+    (* yep *)
+    source = sender ;
+    payer = source ;
     self ;
-    payer ;
     amount ;
     chain_id ;
   }