diff --git a/swaggerize-express/swaggerize-express-tests.ts b/swaggerize-express/swaggerize-express-tests.ts
index 100856618..03a0807ef 100644
--- a/swaggerize-express/swaggerize-express-tests.ts
+++ b/swaggerize-express/swaggerize-express-tests.ts
@@ -1,3 +1,4 @@
+/// <reference path="swaggerize-express.d.ts" />
 import http = require('http');
 import express = require('express');
 import swaggerize = require('swaggerize-express');