1 files changed, 1 insertions, 2 deletions
diff --git a/src/DotNetOpenAuth.Core/Messaging/StandardMessageFactoryChannel.cs b/src/DotNetOpenAuth.Core/Messaging/StandardMessageFactoryChannel.cs
index 7ca5d45..9cb80b0 100644
--- a/src/DotNetOpenAuth.Core/Messaging/StandardMessageFactoryChannel.cs
+++ b/src/DotNetOpenAuth.Core/Messaging/StandardMessageFactoryChannel.cs
@@ -7,10 +7,10 @@
 namespace DotNetOpenAuth.Messaging {
 	using System;
 	using System.Collections.Generic;
-	using System.Diagnostics.Contracts;
 	using System.Linq;
 	using System.Text;
 	using Reflection;
+	using Validation;
 
 	/// <summary>
 	/// A channel that uses the standard message factory.
@@ -98,7 +98,6 @@ namespace DotNetOpenAuth.Messaging {
 		{
 			Requires.NotNull(messageTypes, "messageTypes");
 			Requires.NotNull(descriptionsCache, "descriptionsCache");
-			Contract.Ensures(Contract.Result<IEnumerable<MessageDescription>>() != null);
 
 			// Get all the MessageDescription objects through the standard cache,
 			// so that perhaps it will be a quick lookup, or at least it will be