diff --git a/drivers/mtd/maps/nettel.c b/drivers/mtd/maps/nettel.c
index 632eb2a..54a3102 100644
--- a/drivers/mtd/maps/nettel.c
+++ b/drivers/mtd/maps/nettel.c
@@ -128,8 +128,7 @@
 	}
 };
 
-#define NUM_AMD_PARTITIONS \
-	(sizeof(nettel_amd_partitions)/sizeof(nettel_amd_partitions[0]))
+#define NUM_AMD_PARTITIONS ARRAY_SIZE(nettel_amd_partitions)
 
 /****************************************************************************/