diff --git a/seedrandom/seedrandom-tests.ts b/seedrandom/seedrandom-tests.ts
index 1f913a406..69a11622f 100644
--- a/seedrandom/seedrandom-tests.ts
+++ b/seedrandom/seedrandom-tests.ts
@@ -1,3 +1,5 @@
+/// <reference path="./seedrandom.d.ts" />
+
 import seedrandom = require("seedrandom");
 
 var rng = seedrandom("hello.");