diff --git a/node-polyglot/node-polyglot-tests.ts b/node-polyglot/node-polyglot-tests.ts
index fee07d79e..249be9577 100644
--- a/node-polyglot/node-polyglot-tests.ts
+++ b/node-polyglot/node-polyglot-tests.ts
@@ -1,3 +1,5 @@
+/// <reference path="./node-polyglot.d.ts" />
+
 import Polyglot = require("node-polyglot");
 
 function instantiatePolyglot(): void {