diff --git a/compiler/lib/link_js.ml b/compiler/lib/link_js.ml
index 63e8639d5..cdd4d610c 100644
--- a/compiler/lib/link_js.ml
+++ b/compiler/lib/link_js.ml
@@ -409,8 +409,8 @@ let link ~output ~linkall ~mklib ~toplevel ~files ~resolve_sourcemap_url ~source
       | Some bi ->
           Build_info.configure bi;
           let primitives =
-            List.fold_left units ~init:[] ~f:(fun acc (u : Unit_info.t) ->
-                acc @ u.primitives)
+            List.fold_left units ~init:StringSet.empty ~f:(fun acc (u : Unit_info.t) ->
+                StringSet.union acc (StringSet.of_list u.primitives))
           in
           let code =
             Parse_bytecode.link_info
diff --git a/compiler/lib/parse_bytecode.ml b/compiler/lib/parse_bytecode.ml
index 9ed5bf484..1caac8caf 100644
--- a/compiler/lib/parse_bytecode.ml
+++ b/compiler/lib/parse_bytecode.ml
@@ -3161,6 +3161,10 @@ let link_info ~target ~symtable ~primitives ~crcs =
       []
     |> Array.of_list
   in
+  let primitives =
+    (* Add the externals translated by jsoo directly (in generate.ml) *)
+    StringSet.union (Primitive.get_external ()) primitives |> StringSet.elements
+  in
   let body = [] in
   let body =
     (* Include linking information *)
diff --git a/compiler/lib/parse_bytecode.mli b/compiler/lib/parse_bytecode.mli
index 5500e4f4a..244472cd4 100644
--- a/compiler/lib/parse_bytecode.mli
+++ b/compiler/lib/parse_bytecode.mli
@@ -95,6 +95,6 @@ val predefined_exceptions : target:[ `JavaScript | `Wasm ] -> Code.program * Uni
 val link_info :
      target:[ `JavaScript | `Wasm ]
   -> symtable:Ocaml_compiler.Symtable.GlobalMap.t
-  -> primitives:string list
+  -> primitives:StringSet.t
   -> crcs:(string * Digest.t option) list
   -> Code.program
diff --git a/compiler/tests-toplevel/dune b/compiler/tests-toplevel/dune
index ba0474819..2e541eec6 100644
--- a/compiler/tests-toplevel/dune
+++ b/compiler/tests-toplevel/dune
@@ -7,7 +7,9 @@
  (libraries js_of_ocaml-compiler.dynlink compiler-libs.toplevel)
  (flags
   (:standard -linkall))
- (modes byte))
+ (js_of_ocaml
+  (flags :standard --toplevel))
+ (modes byte js))
 
 (rule
  (targets test_toplevel.js)
@@ -31,6 +33,19 @@
    %{target}
    (run node ./test_toplevel.js))))
 
+(rule
+ (target test_toplevel.referencebcjs)
+ (deps test_toplevel.bc.js)
+ (enabled_if
+  (and
+   (<> %{profile} wasm)
+   (<> %{profile} wasm-effects)
+   (>= %{ocaml_version} 5.2)))
+ (action
+  (with-stdout-to
+   %{target}
+   (run node ./test_toplevel.bc.js))))
+
 (rule
  (alias runtest)
  (enabled_if
@@ -40,4 +55,6 @@
    (>= %{ocaml_version} 5.2)))
  (deps test_toplevel.reference test_toplevel.referencejs)
  (action
-  (diff test_toplevel.reference test_toplevel.referencejs)))
+  (progn
+   (diff test_toplevel.reference test_toplevel.referencebcjs)
+   (diff test_toplevel.reference test_toplevel.referencejs))))
diff --git a/compiler/tests-toplevel/test_toplevel.ml b/compiler/tests-toplevel/test_toplevel.ml
index fde3c4579..e35a3ea90 100644
--- a/compiler/tests-toplevel/test_toplevel.ml
+++ b/compiler/tests-toplevel/test_toplevel.ml
@@ -1,9 +1,13 @@
 let () =
-  let content = {|
+  let content =
+    {|
 let () = print_endline "hello";;
+1+1;;
 1+;;
 Missing_module.f;;
-|} in
+let y = float 1 /. float 3;;
+|}
+  in
   Topdirs.dir_directory "/static/cmis";
   Toploop.initialize_toplevel_env ();
   Toploop.input_name := "//toplevel//";
diff --git a/compiler/tests-toplevel/test_toplevel.reference b/compiler/tests-toplevel/test_toplevel.reference
index 3ab394a97..81e85b344 100644
--- a/compiler/tests-toplevel/test_toplevel.reference
+++ b/compiler/tests-toplevel/test_toplevel.reference
@@ -1,5 +1,7 @@
 hello
-Line 3, characters 2-4:
+- : int = 2
+Line 4, characters 2-4:
 Error: Syntax error
-Line 4, characters 0-16:
-Error: Unbound module Missing_module
+Line 5, characters 0-16:
+Error: Unbound module "Missing_module"
+val y : float = 0.333333333333333315