diff --git a/src/passes/2-simplify/pascaligo.ml b/src/passes/2-simplify/pascaligo.ml
index 92f8c14aa..18f2d8585 100644
--- a/src/passes/2-simplify/pascaligo.ml
+++ b/src/passes/2-simplify/pascaligo.ml
@@ -119,17 +119,6 @@ module Errors = struct
     ] in
     error ~data title message
 
-  let unsupported_map_patches patch =
-    let title () = "map patches" in
-    let message () =
-      Format.asprintf "map patches (a.k.a. functional updates) are \
-                       not supported yet" in
-    let data = [
-      ("patch_loc",
-       fun () -> Format.asprintf "%a" Location.pp_lift @@ patch.Region.region)
-    ] in
-    error ~data title message
-
   let unsupported_deep_set_rm path =
     let title () = "set removals" in
     let message () =
@@ -795,8 +784,29 @@ and simpl_single_instruction : Raw.single_instr -> (_ -> expression result) resu
       in
       return_statement @@ expr
     )
-  | MapPatch patch ->
-      fail @@ unsupported_map_patches patch
+  | MapPatch patch -> (
+      let (map_p, loc) = r_split patch in
+      let (name, access_path) = simpl_path map_p.path in
+      let%bind inj = bind_list
+          @@ List.map (fun (x:Raw.binding Region.reg) ->
+            let x = x.value in
+            let (key, value) = x.source, x.image in
+            let%bind key' = simpl_expression key in
+            let%bind value' = simpl_expression value
+            in ok @@ (key', value')
+          )
+        @@ pseq_to_list map_p.map_inj.value.elements in
+      let expr =
+        match inj with
+        | [] -> e_skip ~loc ()
+        | _ :: _ ->
+          let assigns = List.fold_right
+              (fun (key, value) map -> (e_map_add key value map))
+              inj
+              (e_accessor ~loc (e_variable name) access_path)
+          in e_assign ~loc name access_path assigns
+      in return_statement @@ expr
+    )
   | SetPatch patch -> (
       let (setp, loc) = r_split patch in
       let (name , access_path) = simpl_path setp.path in
@@ -808,13 +818,12 @@ and simpl_single_instruction : Raw.single_instr -> (_ -> expression result) resu
         match inj with
         | [] -> e_skip ~loc ()
         | _ :: _ ->
-          let assigns = List.fold_left
-            (fun s hd -> e_constant "SET_ADD" [hd ; s])
-            (e_accessor ~loc (e_variable name) access_path) inj in
+          let assigns = List.fold_right
+            (fun hd s -> e_constant "SET_ADD" [hd ; s])
+            inj (e_accessor ~loc (e_variable name) access_path) in
           e_assign ~loc name access_path assigns in
       return_statement @@ expr
     )
-
   | MapRemove r -> (
       let (v , loc) = r_split r in
       let key = v.key in
diff --git a/src/test/contracts/map.ligo b/src/test/contracts/map.ligo
index 7437cfb26..a022379cd 100644
--- a/src/test/contracts/map.ligo
+++ b/src/test/contracts/map.ligo
@@ -25,6 +25,17 @@ function rm (var m : foobar) : foobar is block {
   remove 42 from map m
 } with m
 
+function patch_ (var m: foobar) : foobar is block {
+  patch m with map [0 -> 5; 1 -> 6; 2 -> 7]
+} with m
+
+function patch_empty (var m : foobar) : foobar is block {
+  patch m with map []
+} with m
+
+function patch_deep (var m: foobar * nat) : foobar * nat is
+  begin patch m.0 with map [1 -> 9]; end with m
+
 function size_ (const m : foobar) : nat is
   block {skip} with (size(m))
 
@@ -60,4 +71,4 @@ var coco : (int*foobar) := (0, m);
 block {
   remove 42 from map coco.1 ;
   coco.1[32] := 16 ;
-} with coco.1
\ No newline at end of file
+} with coco.1
diff --git a/src/test/contracts/map.mligo b/src/test/contracts/map.mligo
index 094252c0e..829201b23 100644
--- a/src/test/contracts/map.mligo
+++ b/src/test/contracts/map.mligo
@@ -11,6 +11,15 @@ let set_ (n : int) (m : foobar) : foobar =
 
 let rm (m : foobar) : foobar = Map.remove 42 m
 
+(* Dummy test so that we can add the same test for PascaLIGO *)
+let patch_ (m : foobar) : foobar = Map.literal [ (0, 5) ; (1, 6) ; (2, 7) ]
+
+(* Second dummy test, see above *)
+let patch_empty (m : foobar) : foobar = Map.literal [ (0, 0) ; (1, 1) ; (2, 2) ]
+
+(* Third dummy test, see above *)
+let patch_deep (m: foobar * nat) : foobar * nat = (Map.literal [ (0, 0) ; (1, 9) ; (2, 2) ], 10p)
+
 let size_ (m : foobar) : nat = Map.size m
 
 let gf (m : foobar) : int = Map.find 23 m
@@ -34,4 +43,4 @@ let deep_op (m : foobar) : foobar =
   let coco = (0,m) in
   let coco = (0 , Map.remove 42 coco.(1)) in
   let coco = (0 , Map.update 32 (Some 16) coco.(1)) in
-  coco.(1)
\ No newline at end of file
+  coco.(1)
diff --git a/src/test/integration_tests.ml b/src/test/integration_tests.ml
index 38c0869a5..1daf4c046 100644
--- a/src/test/integration_tests.ml
+++ b/src/test/integration_tests.ml
@@ -427,6 +427,25 @@ let map_ type_f path : unit result =
     let expected = ez [23, 23] in
     expect_eq program "rm" input expected
   in
+  let%bind () =
+    let input = ez [(0,0) ; (1,1) ; (2,2)] in
+    let expected = ez [(0, 5) ; (1, 6) ; (2, 7)] in
+    expect_eq program "patch_" input expected
+  in
+  let%bind () =
+    let input = ez [(0,0) ; (1,1) ; (2,2)] in
+    let expected = ez [(0,0) ; (1,1) ; (2,2)] in
+    expect_eq program "patch_empty" input expected
+  in
+  let%bind () =
+    let input = (e_pair
+                   (ez [(0,0) ; (1,1) ; (2,2)])
+                   (e_nat 10)) in
+    let expected = (e_pair
+                      (ez [(0,0) ; (1,9) ; (2,2)])
+                      (e_nat 10)) in
+    expect_eq program "patch_deep" input expected
+  in
   let%bind () =
     let make_input = fun n -> ez List.(map (fun x -> (x, x)) @@ range n) in
     let make_expected = e_nat in