diff --git a/v8js_convert.cc b/v8js_convert.cc
index accf4aa..222a94b 100644
--- a/v8js_convert.cc
+++ b/v8js_convert.cc
@@ -504,10 +504,11 @@ static void php_v8js_invoke_callback(const v8::FunctionCallbackInfo<v8::Value>&
 		v8::String::Utf8Value str(self->GetConstructorName()->ToString());
 		const char *constructor_name = ToCString(str);
 
-		zend_class_entry *ce = zend_fetch_class_by_name(constructor_name, str.length(), NULL, 0);
+		zend_class_entry **pce;
+		zend_lookup_class(constructor_name, str.length(), &pce);
 		v8::Local<v8::FunctionTemplate> new_tpl;
 		new_tpl = v8::Local<v8::FunctionTemplate>::New
-			(isolate, ctx->template_cache.at(ce->name));
+			(isolate, ctx->template_cache.at((*pce)->name));
 
 		result = new_tpl->GetFunction()->NewInstance(argc, argv);
 	} else {