diff --git a/test/Microsoft.AspNet.Razor.Test/Utils/MiscUtils.cs b/test/Microsoft.AspNet.Razor.Test/Utils/MiscUtils.cs
index 435025c49c..bc6c03d916 100644
--- a/test/Microsoft.AspNet.Razor.Test/Utils/MiscUtils.cs
+++ b/test/Microsoft.AspNet.Razor.Test/Utils/MiscUtils.cs
@@ -4,6 +4,7 @@
 using System;
 #if DEBUG
 using System.Diagnostics;
+using System.Threading;
 #endif
 using Xunit;