@@ -1570,17 +1570,17 @@ void CompileSerializeMain(const FunctionCallbackInfo<Value>& args) {
   CHECK(args[0]->IsString());
   Local<String> filename = args[0].As<String>();
   Local<String> source = args[1].As<String>();
+  Environment* env = Environment::GetCurrent(args);
   Isolate* isolate = args.GetIsolate();
   Local<Context> context = isolate->GetCurrentContext();
   // TODO(joyeecheung): do we need all of these? Maybe we would want a less
   // internal version of them.
-  LocalVector<String> parameters(
-      isolate,
-      {
-          FIXED_ONE_BYTE_STRING(isolate, "require"),
-          FIXED_ONE_BYTE_STRING(isolate, "__filename"),
-          FIXED_ONE_BYTE_STRING(isolate, "__dirname"),
-      });
+  LocalVector<String> parameters(isolate,
+                                 {
+                                     env->require_string(),
+                                     env->__filename_string(),
+                                     env->__dirname_string(),
+                                 });
 
   ScriptOrigin script_origin(filename, 0, 0, true);
   ScriptCompiler::Source script_source(source, script_origin);