Visual Studio 2013 User-Defined Keyword Scope Issues

Question

I'm working on a C++ project with VS2013 Express and I'm having a problem with syntax highlighting.

It's a pretty low-level embedded project, so I'm working with some stdint.h types such as uint8_t and uint16_t fairly regularly. Visual Studio won't highlight these types by default, so I created some user keywords for the types I'm using all over the place.

My problem is that Visual Studio only seems to highlight the keywords in certain contexts. Here's a link to what it looks like.

Visual Studio has no problems highlighting the keywords in the global scope of my file, but inside the function definition and function body the keywords are no longer highlighted.

Is there any workaround for this? The Font and Colors configuration in Visual Studio's options seem to be as language-neutral as possible and have no mention of scoping, and none of the C/C++ options seem to address this. Thanks.