diff --git a/compiler/bin-js_of_ocaml/build_fs.ml b/compiler/bin-js_of_ocaml/build_fs.ml
index 16ac22a23d..3d20db9454 100644
--- a/compiler/bin-js_of_ocaml/build_fs.ml
+++ b/compiler/bin-js_of_ocaml/build_fs.ml
@@ -61,6 +61,7 @@ function jsoo_create_file_extern(name,content){
 }
 |}
   in
+  Config.set_target `JavaScript;
   let fragments = Linker.Fragment.parse_string code in
   Linker.load_fragments ~target_env:Isomorphic ~filename:"<dummy>" fragments;
   Linker.check_deps ();