diff --git a/native_mate/constructor.h b/native_mate/constructor.h
index c6deead3ece8..7cad253e0ea6 100644
--- a/native_mate/constructor.h
+++ b/native_mate/constructor.h
@@ -127,7 +127,7 @@ MATE_METHOD_RETURN_TYPE InvokeNew(const base::Callback<Sig>& factory,
   WrappableBase* object;
   {
     // Don't continue if the constructor throws an exception.
-    v8::TryCatch try_catch;
+    v8::TryCatch try_catch(isolate);
     object = internal::InvokeFactory(args, factory);
     if (try_catch.HasCaught()) {
       try_catch.ReThrow();
diff --git a/native_mate/object_template_builder.h b/native_mate/object_template_builder.h
index de953d381c2f..533576f98630 100644
--- a/native_mate/object_template_builder.h
+++ b/native_mate/object_template_builder.h
@@ -69,7 +69,7 @@ class ObjectTemplateBuilder {
  public:
   explicit ObjectTemplateBuilder(
       v8::Isolate* isolate,
-      v8::Local<v8::ObjectTemplate> templ = v8::ObjectTemplate::New());
+      v8::Local<v8::ObjectTemplate> templ);
   ~ObjectTemplateBuilder();
 
   // It's against Google C++ style to return a non-const ref, but we take some