diff --git a/node-snap7/node-snap7.d.ts b/node-snap7/node-snap7.d.ts
index 3a8c7dbf6b..b3fad4fad0 100644
--- a/node-snap7/node-snap7.d.ts
+++ b/node-snap7/node-snap7.d.ts
@@ -5,6 +5,8 @@
 
 // see: https://www.npmjs.com/package/node-snap7#api
 
+/// <reference path="../node/node.d.ts" />
+
 declare module "node-snap7" {
 
   export enum ConnectionType {