Preprocessor #define acting strange.

I have several pins relabeled using the #define directive in a header file called "gpio.h".  Several files reference this file.  In main.c I reference this file with the fallowing command:

#include "gpio.h"

The gpio.h file has the following structure:

#ifndef __gpio_H
#define __gpio_H

#define FW_PROBE_DIG_1_Pin GPIO_PIN_12
#define FW_PROBE_DIG_1_GPIO_Port GPIOE
#define FW_PROBE_DIG_2_Pin GPIO_PIN_13
#define FW_PROBE_DIG_2_GPIO_Port GPIOE

#endif /* __gpio_H */

My code in "main.c" works when using the value "GPIOE" but doesn't work when using "FW_PROBE_DIG_1_GPIO_Port".  The code compiles but the "GPIO" hardware pin only responds when I use the "GPIOE" in my function call.

Any ideas?