1 files changed, 1 insertions, 1 deletions
diff --git a/src/DotNetOpenAuth.OpenId.RelyingParty/OpenId/ChannelElements/ExtensionsBindingElementRelyingParty.cs b/src/DotNetOpenAuth.OpenId.RelyingParty/OpenId/ChannelElements/ExtensionsBindingElementRelyingParty.cs
index fca62f8..be98d29 100644
--- a/src/DotNetOpenAuth.OpenId.RelyingParty/OpenId/ChannelElements/ExtensionsBindingElementRelyingParty.cs
+++ b/src/DotNetOpenAuth.OpenId.RelyingParty/OpenId/ChannelElements/ExtensionsBindingElementRelyingParty.cs
@@ -7,10 +7,10 @@
 namespace DotNetOpenAuth.OpenId.ChannelElements {
 	using System;
 	using System.Collections.Generic;
-	using System.Diagnostics.Contracts;
 	using System.Linq;
 	using System.Text;
 	using DotNetOpenAuth.OpenId.RelyingParty;
+	using Validation;
 
 	/// <summary>
 	/// The OpenID binding element responsible for reading/writing OpenID extensions