1 files changed, 1 insertions, 1 deletions
diff --git a/src/DotNetOpenAuth.OpenId.Provider/OpenId/ChannelElements/OpenIdProviderChannel.cs b/src/DotNetOpenAuth.OpenId.Provider/OpenId/ChannelElements/OpenIdProviderChannel.cs
index c18bcac..45a69a5 100644
--- a/src/DotNetOpenAuth.OpenId.Provider/OpenId/ChannelElements/OpenIdProviderChannel.cs
+++ b/src/DotNetOpenAuth.OpenId.Provider/OpenId/ChannelElements/OpenIdProviderChannel.cs
@@ -7,13 +7,13 @@
 namespace DotNetOpenAuth.OpenId.ChannelElements {
 	using System;
 	using System.Collections.Generic;
-	using System.Diagnostics.Contracts;
 	using System.Linq;
 	using System.Text;
 	using DotNetOpenAuth.Messaging;
 	using DotNetOpenAuth.Messaging.Bindings;
 	using DotNetOpenAuth.OpenId.Extensions;
 	using DotNetOpenAuth.OpenId.Provider;
+	using Validation;
 
 	/// <summary>
 	/// The messaging channel for OpenID Providers.