diff --git a/node-snap7/node-snap7-tests.ts b/node-snap7/node-snap7-tests.ts
index c2ea59065..19ae7871a 100644
--- a/node-snap7/node-snap7-tests.ts
+++ b/node-snap7/node-snap7-tests.ts
@@ -2,6 +2,9 @@
 // see: https://github.com/mathiask88/node-snap7-testsuite
 // see: http://definitelytyped.org/guides/contributing.html
 
+/// <reference path="../node/node.d.ts" />
+/// <reference path="node-snap7.d.ts" />
+
 import snap7 = require("node-snap7");
 
 // Playing Variables ...