diff --git a/src/proto_alpha/lib_protocol/src/alpha_context.mli b/src/proto_alpha/lib_protocol/src/alpha_context.mli
index 017e73adf..668758e35 100644
--- a/src/proto_alpha/lib_protocol/src/alpha_context.mli
+++ b/src/proto_alpha/lib_protocol/src/alpha_context.mli
@@ -304,7 +304,6 @@ module Script : sig
   val force_decode : lazy_expr -> (expr * Gas.cost) tzresult
   val force_bytes : lazy_expr -> (MBytes.t * Gas.cost) tzresult
   val minimal_deserialize_cost : lazy_expr -> Gas.cost
-  val minimal_serialize_cost : lazy_expr -> Gas.cost
 end
 
 module Constants : sig
diff --git a/src/proto_alpha/lib_protocol/src/script_repr.ml b/src/proto_alpha/lib_protocol/src/script_repr.ml
index bdad89873..d0f0d2948 100644
--- a/src/proto_alpha/lib_protocol/src/script_repr.ml
+++ b/src/proto_alpha/lib_protocol/src/script_repr.ml
@@ -132,15 +132,3 @@ let minimal_deserialize_cost lexpr =
     (fun b -> alloc_bytes_cost (MBytes.length b))
     (fun c_free _ -> c_free)
     lexpr
-
-let minimal_serialize_cost lexpr =
-  let open Gas_limit_repr in
-  Data_encoding.fold_lazy
-    (fun v ->
-       let blocks, _words = expr_size v in
-       step_cost blocks +@
-       alloc_bytes_cost blocks (* TODO *)
-    )
-    (fun _ -> Gas_limit_repr.free)
-    (fun _ c_free -> c_free)
-    lexpr
diff --git a/src/proto_alpha/lib_protocol/src/script_repr.mli b/src/proto_alpha/lib_protocol/src/script_repr.mli
index 8299c38ff..eb319a201 100644
--- a/src/proto_alpha/lib_protocol/src/script_repr.mli
+++ b/src/proto_alpha/lib_protocol/src/script_repr.mli
@@ -40,5 +40,3 @@ val force_decode : lazy_expr -> (expr * Gas_limit_repr.cost) tzresult
 val force_bytes : lazy_expr -> (MBytes.t * Gas_limit_repr.cost) tzresult
 
 val minimal_deserialize_cost : lazy_expr -> Gas_limit_repr.cost
-
-val minimal_serialize_cost : lazy_expr -> Gas_limit_repr.cost
diff --git a/src/proto_alpha/lib_protocol/src/storage.ml b/src/proto_alpha/lib_protocol/src/storage.ml
index f425e4e01..e34bbdeba 100644
--- a/src/proto_alpha/lib_protocol/src/storage.ml
+++ b/src/proto_alpha/lib_protocol/src/storage.ml
@@ -159,9 +159,8 @@ module Contract = struct
 
     let consume_serialize_gas ctxt value =
       Lwt.return @@
-      ( Raw_context.consume_gas ctxt (Script_repr.minimal_serialize_cost value) >>? fun _ ->
-        Script_repr.force_bytes value >>? fun (_value, value_cost) ->
-        Raw_context.consume_gas ctxt value_cost)
+      (Script_repr.force_bytes value >>? fun (_value, value_cost) ->
+       Raw_context.consume_gas ctxt value_cost)
 
     let get ctxt contract =
       get ctxt contract >>=? fun (ctxt, value) ->