diff --git a/src/Microsoft.AspNet.Mvc.Core/MvcOptions.cs b/src/Microsoft.AspNet.Mvc.Core/MvcOptions.cs
index 8bb53e32cc..e362341932 100644
--- a/src/Microsoft.AspNet.Mvc.Core/MvcOptions.cs
+++ b/src/Microsoft.AspNet.Mvc.Core/MvcOptions.cs
@@ -7,6 +7,7 @@ using Microsoft.AspNet.Mvc.ApplicationModels;
 using Microsoft.AspNet.Mvc.Core;
 using Microsoft.AspNet.Mvc.OptionDescriptors;
 using Microsoft.AspNet.Mvc.ModelBinding;
+using Microsoft.Net.Http.Headers;
 
 namespace Microsoft.AspNet.Mvc
 {