diff --git a/src/MusicStore/StartupNtlmAuthentication.cs b/src/MusicStore/StartupNtlmAuthentication.cs
index 09c3300bc9..ed1c6cb15a 100644
--- a/src/MusicStore/StartupNtlmAuthentication.cs
+++ b/src/MusicStore/StartupNtlmAuthentication.cs
@@ -1,6 +1,5 @@
 using System;
 using System.Security.Claims;
-using System.Security.Principal;
 using Microsoft.AspNet.Authorization;
 using Microsoft.AspNet.Builder;
 using Microsoft.AspNet.Diagnostics;