diff --git a/jsdom/jsdom-tests.ts b/jsdom/jsdom-tests.ts
index 504f1f064..1f0d04a0b 100644
--- a/jsdom/jsdom-tests.ts
+++ b/jsdom/jsdom-tests.ts
@@ -1,3 +1,5 @@
+/// <reference path="./jsdom.d.ts" />
+
 import jsdom = require("jsdom");
 
 jsdom.defaultDocumentFeatures.FetchExternalResources = ["img"];