diff --git a/fdisk/fdisk.h b/fdisk/fdisk.h
index 75dd88ecd..6ef68b6e7 100644
--- a/fdisk/fdisk.h
+++ b/fdisk/fdisk.h
@@ -2,6 +2,8 @@
    fdisk.h
 */
 
+#include "c.h"
+
 #define DEFAULT_SECTOR_SIZE	512
 #define MAX_SECTOR_SIZE	2048
 #define SECTOR_SIZE	512	/* still used in BSD code */
@@ -21,8 +23,6 @@
 #define IS_EXTENDED(i) \
 	((i) == EXTENDED || (i) == WIN98_EXTENDED || (i) == LINUX_EXTENDED)
 
-#define SIZE(a)	(sizeof(a)/sizeof((a)[0]))
-
 #define cround(n)	(display_in_cyl_units ? ((n)/units_per_sector)+1 : (n))
 #define scround(x)	(((x)+units_per_sector-1)/units_per_sector)
 
diff --git a/fdisk/fdiskbsdlabel.h b/fdisk/fdiskbsdlabel.h
index 461c2acc7..9f9e0918a 100644
--- a/fdisk/fdiskbsdlabel.h
+++ b/fdisk/fdiskbsdlabel.h
@@ -224,7 +224,7 @@ static struct systypes xbsd_fstypes[] = {
 	{BSD_FS_ADVFS,	"AdvFS"},
 	{ 0, NULL }
 };
-#define BSD_FSMAXTYPES (SIZE(xbsd_fstypes)-1)
+#define BSD_FSMAXTYPES (ARRAY_SIZE(xbsd_fstypes)-1)
 
 #endif
 
diff --git a/fdisk/fdisksunlabel.c b/fdisk/fdisksunlabel.c
index 935c92a73..be7b9f6a4 100644
--- a/fdisk/fdisksunlabel.c
+++ b/fdisk/fdisksunlabel.c
@@ -382,7 +382,7 @@ void verify_sun(void)
         else
             array[i] = -1;
     }
-    qsort(array,SIZE(array),sizeof(array[0]),
+    qsort(array,ARRAY_SIZE(array),sizeof(array[0]),
 	  (int (*)(const void *,const void *)) verify_sun_cmp);
     if (array[0] == -1) {
     	printf(_("No partitions defined\n"));