Suppress inspection "Namespace does not correspond to a file location" with comment not working

I have the below code and ReSharper is still flagging a problem with the namespace.

// ReSharper disable CheckNamespace
namespace SPDisposeCheck
// ReSharper restore CheckNamespace

What else do I have to do to tell it not to worry?!

JetBrains ReSharper 5.1 Full Edition
Build 5.1.3000.12 on 2011-01-28T04:05:56

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Plugins: none.
Visual Studio 10.0.30319.1.

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