diff --git a/protobufjs/protobufjs-tests.ts b/protobufjs/protobufjs-tests.ts
index 7b910d3801..148eb05e34 100644
--- a/protobufjs/protobufjs-tests.ts
+++ b/protobufjs/protobufjs-tests.ts
@@ -1,4 +1,4 @@
-/// <reference path="protobuf.d.ts" />
+/// <reference path="protobufjs.d.ts" />
 
 import ProtoBuf = require("protobufjs");