diff --git a/sys/arm/include/cpufunc.h b/sys/arm/include/cpufunc.h
index 0b54b59a771..6562042dac0 100644
--- a/sys/arm/include/cpufunc.h
+++ b/sys/arm/include/cpufunc.h
@@ -178,8 +178,8 @@ void cpu_reset		(void) __attribute__((__noreturn__));
  */
 
 /* PRIMARY CACHE VARIABLES */
-extern int	arm_dcache_align;
-extern int	arm_dcache_align_mask;
+extern unsigned int	arm_dcache_align;
+extern unsigned int	arm_dcache_align_mask;
 
 #else	/* !_KERNEL */