diff --git a/rescript-syntax/ppx_rescript_compat/ppx_rescript_compat.ml b/rescript-syntax/ppx_rescript_compat/ppx_rescript_compat.ml
index 05109c60df..bad7dd5342 100644
--- a/rescript-syntax/ppx_rescript_compat/ppx_rescript_compat.ml
+++ b/rescript-syntax/ppx_rescript_compat/ppx_rescript_compat.ml
@@ -44,10 +44,11 @@ let expr_mapper (self : mapper) (expr : Parsetree.expression) =
           Melange_ppx.Ast_uncurry_apply.property_apply loc self obj name args;
       }
   | Pexp_send
-      ( ({ pexp_desc = Pexp_apply _ | Pexp_ident _; pexp_loc; _ } as subexpr),
+      ( ({ pexp_desc = Pexp_apply _ | Pexp_ident _ | Pexp_send _; pexp_loc; _ } as subexpr),
         arg ) ->
       (* ReScript removed the OCaml object system and abuses `Pexp_send` for
          `obj##property`. Here, we make that conversion. *)
+      let subexpr = self.expr self subexpr in
       {
         expr with
         pexp_desc =
diff --git a/test/gh489.t b/test/gh489.t
index 4872ae23cb..cf6a8f32b7 100644
--- a/test/gh489.t
+++ b/test/gh489.t
@@ -27,12 +27,15 @@ Now let's try with ReScript syntax
   type nonrec person = < age: int [@set ]  >  Js.t
   type nonrec entry = < person: person [@set ]  >  Js.t
   external entry : entry = "entry"[@@val ]
-  ;;(entry ## person)#age #= 99
+  ;;((entry ## person) ## age) #= 99
 
   $ rescript_syntax -print=ml foo.res > foo.ml
 
   $ melc foo.ml
-  melc: internal error, uncaught exception:
-        File "jscomp/frontend/ast_exp_apply.ml", line 252, characters 17-23: Assertion failed
-        
-  [125]
+  // Generated by Melange
+  'use strict';
+  
+  
+  entry.person.age = 99;
+  
+  /*  Not a pure module */