diff --git a/compiler/num-testsuite/test.ml b/compiler/num-testsuite/test.ml
index 89bae70cf6..8b05039648 100644
--- a/compiler/num-testsuite/test.ml
+++ b/compiler/num-testsuite/test.ml
@@ -5,7 +5,7 @@ let flush_all () = flush stdout; flush stderr;;
 let message s = print_string s; print_newline ();;
 
 let error_occurred = ref false;;
-let immediate_failure = ref false;;
+let immediate_failure = ref true;;
 
 let error () =
  if !immediate_failure then exit 2 else begin
diff --git a/runtime/dynlink.js b/runtime/dynlink.js
index b714a4495d..2fda72ef42 100644
--- a/runtime/dynlink.js
+++ b/runtime/dynlink.js
@@ -22,7 +22,7 @@ var current_libs = [0, joo_global_object]
 //Provides: caml_dynlink_open_lib
 //Requires: current_libs, caml_failwith
 function caml_dynlink_open_lib (_mode,file) {
-    var name = file;
+    var name = file.toString();
     joo_global_object.console.log("Dynlink: try to open ", name);
     //caml_failwith("file not found: "+name)
     current_libs.push({});
@@ -39,7 +39,7 @@ function caml_dynlink_close_lib (idx) {
 //Provides: caml_dynlink_lookup_symbol
 //Requires: current_libs
 function caml_dynlink_lookup_symbol (idx, fun_name) {
-  var name = fun_name;
+  var name = fun_name.toString();
   joo_global_object.console.log("Dynlink: look for symbol ", name);
   if(current_libs[idx] && current_libs[idx][name])
     return current_libs[idx][name];
diff --git a/runtime/toplevel.js b/runtime/toplevel.js
index 06437014bf..5811722ebf 100644
--- a/runtime/toplevel.js
+++ b/runtime/toplevel.js
@@ -61,10 +61,8 @@ function caml_reify_bytecode (code, _sz) {
 //Requires: caml_failwith
 //Version: >= 4.08
 function caml_reify_bytecode (code, _sz,_) {
-  if(joo_global_object.toplevelCompile) {
-    var x = joo_global_object.toplevelCompile(code);
-    return [0, 0, x];
-  }
+  if(joo_global_object.toplevelCompile)
+    return [0, 0, joo_global_object.toplevelCompile(code)];
   else caml_failwith("Toplevel not initialized (toplevelCompile)")
 }
 
diff --git a/toplevel/examples/lwt_toplevel/dune b/toplevel/examples/lwt_toplevel/dune
index 12454de9b2..d154d8e3d3 100644
--- a/toplevel/examples/lwt_toplevel/dune
+++ b/toplevel/examples/lwt_toplevel/dune
@@ -80,7 +80,6 @@
           --toplevel
 	  --disable shortvar
           --noruntime
-          --pretty
 	  %{lib:js_of_ocaml-compiler:runtime.js}
 	  %{lib:js_of_ocaml-compiler:toplevel.js}
           %{lib:js_of_ocaml-compiler:dynlink.js}
diff --git a/toplevel/lib/jsooTop.ml b/toplevel/lib/jsooTop.ml
index c314897508..7e1fecfef8 100644
--- a/toplevel/lib/jsooTop.ml
+++ b/toplevel/lib/jsooTop.ml
@@ -100,6 +100,7 @@ let setup =
        res);
      Js.Unsafe.global##.toplevelReloc
      := Js.Unsafe.callback (fun name ->
+            let name = Js.to_string name in
             Js_of_ocaml_compiler.Ocaml_compiler.Symtable.reloc_ident name);
      ())