1 files changed, 1 insertions, 1 deletions
diff --git a/src/DotNetOpenAuth.OpenId.RelyingParty/OpenId/RelyingParty/PositiveAuthenticationResponseSnapshot.cs b/src/DotNetOpenAuth.OpenId.RelyingParty/OpenId/RelyingParty/PositiveAuthenticationResponseSnapshot.cs
index f5cf8ad..0e10087 100644
--- a/src/DotNetOpenAuth.OpenId.RelyingParty/OpenId/RelyingParty/PositiveAuthenticationResponseSnapshot.cs
+++ b/src/DotNetOpenAuth.OpenId.RelyingParty/OpenId/RelyingParty/PositiveAuthenticationResponseSnapshot.cs
@@ -7,11 +7,11 @@
 namespace DotNetOpenAuth.OpenId.RelyingParty {
 	using System;
 	using System.Collections.Generic;
-	using System.Diagnostics.Contracts;
 	using System.Text;
 	using System.Web;
 	using DotNetOpenAuth.Messaging;
 	using DotNetOpenAuth.OpenId.Messages;
+	using Validation;
 
 	/// <summary>
 	/// A serializable snapshot of a verified authentication message.