1 files changed, 3 insertions, 2 deletions
diff --git a/src/DotNetOpenAuth.Test/Mocks/CoordinatingOutgoingWebResponse.cs b/src/DotNetOpenAuth.Test/Mocks/CoordinatingOutgoingWebResponse.cs
index 07f9bc9..62ea871 100644
--- a/src/DotNetOpenAuth.Test/Mocks/CoordinatingOutgoingWebResponse.cs
+++ b/src/DotNetOpenAuth.Test/Mocks/CoordinatingOutgoingWebResponse.cs
@@ -7,6 +7,7 @@
 namespace DotNetOpenAuth.Test.Mocks {
 	using System;
 	using System.Collections.Generic;
+	using System.Diagnostics.Contracts;
 	using System.Linq;
 	using System.Text;
 	using DotNetOpenAuth.Messaging;
@@ -20,8 +21,8 @@ namespace DotNetOpenAuth.Test.Mocks {
 		/// <param name="message">The direct response message to send to the remote channel.  This message will be cloned.</param>
 		/// <param name="receivingChannel">The receiving channel.</param>
 		internal CoordinatingOutgoingWebResponse(IProtocolMessage message, CoordinatingChannel receivingChannel) {
-			ErrorUtilities.VerifyArgumentNotNull(message, "message");
-			ErrorUtilities.VerifyArgumentNotNull(receivingChannel, "receivingChannel");
+			Contract.Requires<ArgumentNullException>(message != null);
+			Contract.Requires<ArgumentNullException>(receivingChannel != null);
 
 			this.receivingChannel = receivingChannel;
 			this.OriginalMessage = message;