diff --git a/async/asyncamd-tests.ts b/async/asyncamd-tests.ts
index 4618a67bf5..fc1c254607 100644
--- a/async/asyncamd-tests.ts
+++ b/async/asyncamd-tests.ts
@@ -1,3 +1,5 @@
+/// <reference path="./async.d.ts" />
+
 import async = require("async");
 
-async.map(["a", "b", "c"], (item, cb) => cb(null, [item.toUpperCase()]), (err, results) => { });
\ No newline at end of file
+async.map(["a", "b", "c"], (item, cb) => cb(null, [item.toUpperCase()]), (err, results) => { });