Strange behavior with .h file

I have a standard header file that I am including into my extension so that I can expose the class to PHP. When I include this header file inside my .c file and then make the extension, install it and restart my web server the extension won't load. If I remove this header file then the extension loads just fine. I am at a loss what is going on. The extension compiles just fine with no errors in both cases. Does anyone have any suggestions on how do debug this? I am stuck at this point because the entire project depends on this particular header file being included. :) Thanks, -Eric