diff --git a/hellojs/hellojs-test.ts b/hellojs/hellojs-test.ts
index fbe36ce66..ef0508867 100644
--- a/hellojs/hellojs-test.ts
+++ b/hellojs/hellojs-test.ts
@@ -1,3 +1,5 @@
+/// <reference path="hellojs.d.ts" />
+
 hello.init(
   {
     'facebook': '<app key>',