diff --git a/src/passes/1-parser/pascaligo/AST.ml b/src/passes/1-parser/pascaligo/AST.ml
index 97eab1c20..985ae277e 100644
--- a/src/passes/1-parser/pascaligo/AST.ml
+++ b/src/passes/1-parser/pascaligo/AST.ml
@@ -490,6 +490,7 @@ and closing =
 and map_expr =
   MapLookUp of map_lookup reg
 | MapInj    of binding reg injection reg
+| BigMapInj    of binding reg injection reg
 
 and map_lookup = {
   path  : path;
@@ -647,6 +648,7 @@ and tuple_expr_to_region {region; _} = region
 and map_expr_to_region = function
   MapLookUp {region; _}
 | MapInj    {region; _} -> region
+| BigMapInj {region; _} -> region
 
 and set_expr_to_region = function
   SetInj {region; _}
diff --git a/src/passes/1-parser/pascaligo/AST.mli b/src/passes/1-parser/pascaligo/AST.mli
index a41fb005f..cf8fa3321 100644
--- a/src/passes/1-parser/pascaligo/AST.mli
+++ b/src/passes/1-parser/pascaligo/AST.mli
@@ -481,6 +481,7 @@ and closing =
 and map_expr =
   MapLookUp of map_lookup reg
 | MapInj    of binding reg injection reg
+| BigMapInj    of binding reg injection reg
 
 and map_lookup = {
   path  : path;
diff --git a/src/passes/1-parser/pascaligo/Parser.mly b/src/passes/1-parser/pascaligo/Parser.mly
index 38b86357b..d3dc32568 100644
--- a/src/passes/1-parser/pascaligo/Parser.mly
+++ b/src/passes/1-parser/pascaligo/Parser.mly
@@ -877,6 +877,7 @@ set_expr:
 map_expr:
   map_lookup             { MapLookUp $1 }
 | injection(Map,binding) {    MapInj $1 }
+| injection(BigMap,binding) { BigMapInj $1 }
 
 map_lookup:
   path brackets(expr) {
diff --git a/src/passes/1-parser/pascaligo/ParserLog.ml b/src/passes/1-parser/pascaligo/ParserLog.ml
index e09149bce..2f0fe6268 100644
--- a/src/passes/1-parser/pascaligo/ParserLog.ml
+++ b/src/passes/1-parser/pascaligo/ParserLog.ml
@@ -434,6 +434,7 @@ and print_case_clause_expr buffer {value; _} =
 and print_map_expr buffer = function
   MapLookUp {value; _} -> print_map_lookup buffer value
 | MapInj inj           -> print_injection  buffer "map" print_binding inj
+| BigMapInj inj        -> print_injection  buffer "big_map" print_binding inj
 
 and print_set_expr buffer = function
   SetInj inj -> print_injection buffer "set" print_expr inj
@@ -1445,7 +1446,7 @@ and pp_map_expr buffer ~pad = function
   MapLookUp {value; _} ->
     pp_node buffer ~pad "MapLookUp";
     pp_map_lookup buffer ~pad value
-| MapInj {value; _} ->
+| MapInj {value; _} | BigMapInj {value; _} ->
     pp_node buffer ~pad "MapInj";
     pp_injection pp_binding buffer ~pad value
 
diff --git a/src/passes/2-simplify/pascaligo.ml b/src/passes/2-simplify/pascaligo.ml
index d094f3819..3928d8b5f 100644
--- a/src/passes/2-simplify/pascaligo.ml
+++ b/src/passes/2-simplify/pascaligo.ml
@@ -399,7 +399,7 @@ let rec simpl_expression (t:Raw.expr) : expr result =
       let%bind cases = simpl_cases lst in
       return @@ e_matching ~loc e cases
     )
-  | EMap (MapInj mi) -> (
+  | EMap (MapInj mi)  -> (
       let (mi , loc) = r_split mi in
       let%bind lst =
         let lst = List.map get_value @@ pseq_to_list mi.elements in
@@ -411,6 +411,18 @@ let rec simpl_expression (t:Raw.expr) : expr result =
         bind_map_list aux lst in
       return @@ e_map ~loc lst
     )
+  | EMap (BigMapInj mi) -> (
+      let (mi , loc) = r_split mi in
+      let%bind lst =
+        let lst = List.map get_value @@ pseq_to_list mi.elements in
+        let aux : Raw.binding -> (expression * expression) result =
+          fun b ->
+            let%bind src = simpl_expression b.source in
+            let%bind dst = simpl_expression b.image in
+            ok (src, dst) in
+        bind_map_list aux lst in
+      return @@ e_big_map ~loc lst
+    )
   | EMap (MapLookUp lu) -> (
       let (lu , loc) = r_split lu in
       let%bind path = match lu.path with