1 files changed, 1 insertions, 1 deletions
diff --git a/src/DotNetOpenAuth.OpenId/OpenId/Extensions/AttributeExchange/AXUtilities.cs b/src/DotNetOpenAuth.OpenId/OpenId/Extensions/AttributeExchange/AXUtilities.cs
index 20b8a79..539e570 100644
--- a/src/DotNetOpenAuth.OpenId/OpenId/Extensions/AttributeExchange/AXUtilities.cs
+++ b/src/DotNetOpenAuth.OpenId/OpenId/Extensions/AttributeExchange/AXUtilities.cs
@@ -7,9 +7,9 @@
 namespace DotNetOpenAuth.OpenId.Extensions.AttributeExchange {
 	using System;
 	using System.Collections.Generic;
-	using System.Diagnostics.Contracts;
 	using System.Globalization;
 	using DotNetOpenAuth.Messaging;
+	using Validation;
 
 	/// <summary>
 	/// Helper methods shared by multiple messages in the Attribute Exchange extension.