CCSTUDIO: Writing a debugmode using #ifdef

Hello,
Im using a PGA970 microcontroller and am programming it with C in CCS 10. My code is working so far but i decided to implement a debugmode . The theory seems very simple , if you write 1 to Debugmode when its defined it should compile "doSomething" if there is a 0 it shouldnt. But both configurations compile "doSomething" and run the code. Did I misunderstand something there or is my setup not capable of using #ifdef?

#define Debugmode      0      // For Debugging turn Debugmode ON
//----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
void main(void)
 {
    init();
    while(1)
    {
        #ifdef Debugmode
        doSomething();
        #endif
    }
 }