Customizing inclusion guards in eclipse CDT

Is there a way to customize the format of inclusion guards in eclipse CDT for the class generation template? The current format is <Class Name>_H, but what I would like is something like <namespace>_<namespace>_<class name>_H. Not that I expect to have classes with the same name in different namespaces within my own project, but I'd prefer not to worry about it should the case arise.