Microchip XC32 no warning with "illegal cast"

I have a function that should return the SysTick variable:

uint32_t TickGet(void){
    return SysTick;
}

However SysTick is defined as an int:

int SysTick;

For some reason, the XC32 compiler is perfectly happy with this arrangement. No warnings warnings whatsoever are thrown. Not even with -Wall as a XC32-GCC option.

Does anyone know how to get the XC32 compiler to list this warning?

edit, ofcourse I want the SysTick variable to be defined as an uint32_t. That's besides the point, my problem is with the compiler not throwing warnings for such occasions.