How to get ServiceStack to receive XML request from TFS with XML namespaces

I am trying to wire up TFS 2012 event notifications to ServiceStack, but I just keep getting the error:

{
    "responseStatus": {
        "errorCode": "RequestBindingException",
        "message": "Unable to bind request",
        "stackTrace": "at ServiceStack.WebHost.Endpoints.RestHandler.GetRequest(IHttpRequest httpReq, IRestPath restPath)\r\n   
                       at ServiceStack.WebHost.Endpoints.RestHandler.ProcessRequest (IHttpRequest httpReq, IHttpResponse httpRes, String operationName)"
    }
}

[Route("/releasemanagement/tfsevents/buildcomplete", "POST")]
[DataContract(Namespace = "http://www.w3.org/2001/XMLSchema-instance")]
public class TfsEventBuildComplete : IReturn<BuildCompleteResponse>
{
    [DataMember]
    public string BuildUri { get; set; }

    [DataMember]
    public string TeamFoundationServerUrl { get; set; }

    [DataMember]
    public string TeamProject { get; set; }

    [DataMember]
    public string Title { get; set; }

    [DataMember]
    public string Id { get; set; }

    [DataMember]
    public TfsEventStatusChange StatusChange { get; set; }

    [DataMember]
    public string ChangedBy { get; set; }
}

public class TfsEventStatusChange
{
    public string FieldName { get; set; }

    public string NewValue { get; set; }
}

<BuildStatusChangeEvent xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <BuildUri>vstfs:///Build/Build/4799</BuildUri>
    <TeamFoundationServerUrl>http://TFSURL:8080/tfs/collection</TeamFoundationServerUrl>
    <TeamProject>iSAMS</TeamProject>
    <Title>iSAMS Build Release_20130814.1 Quality Changed To Publish</Title>
    <Subscriber>[02]\Project Collection Service Accounts</Subscriber>
    <Id>Release_20130814.1</Id>
    <Url>http://TFSURL:8080/tfs/web/build.aspx?pcguid=GUID&amp;builduri=vstfs:///Build/Build/4799</Url>
    <TimeZone>GMT Daylight Time</TimeZone>
    <TimeZoneOffset>+01:00:00</TimeZoneOffset>
    <ChangedTime>8/14/2013 9:33:30 AM</ChangedTime>
    <StatusChange>
        <FieldName>Quality</FieldName>
        <NewValue>Publish</NewValue>
    </StatusChange>
    <ChangedBy>DOMAIN\USER</ChangedBy>
</BuildStatusChangeEvent>

I think ServiceStack is effectively failing to deserialise the request due to the namespacing, but I can't figure it out.

Most of what I have tried has come from here:

XML deserializing only works with namespace in xml