diff --git a/credential/credential-tests.ts b/credential/credential-tests.ts
index 6adec112f..6013436b0 100644
--- a/credential/credential-tests.ts
+++ b/credential/credential-tests.ts
@@ -1,4 +1,4 @@
-/// <reference path="credential.d.ts">
+/// <reference path="credential.d.ts" />
 
 import * as credential from 'credential';