How can I have a Report in my 2005 Report Server with a 2010/01 nameSpace?

I am trying to edit a report in my 2005 Report Server, But when I open it up in VS2005 it error because it has a Namespace of 2010/01. I can open it up in VS2013 and edit it but it won't Deploy to a 2005 Report Server(Where it came from)