diff --git a/f32x/gpio-s3c24xx.c b/f32x/gpio-s3c24xx.c
index d4b25b9..b58ed86 100644
--- a/f32x/gpio-s3c24xx.c
+++ b/f32x/gpio-s3c24xx.c
@@ -16,11 +16,13 @@
 #include <fcntl.h>
 #include <sys/mman.h>
 
+#include "gpio-s3c24xx.h"
+
 
 #define BASE 0x56000000
 
 
-volatile void *mem;
+volatile uint32_t *mem;
 
 
 void gpio_init(void)