diff --git a/drivers/scsi/wd33c93.c b/drivers/scsi/wd33c93.c
index d8a7260..9341703 100644
--- a/drivers/scsi/wd33c93.c
+++ b/drivers/scsi/wd33c93.c
@@ -1701,7 +1701,7 @@
 }
 
 #define MAX_WD33C93_HOSTS 4
-#define MAX_SETUP_ARGS ((int)(sizeof(setup_args) / sizeof(char *)))
+#define MAX_SETUP_ARGS ARRAY_SIZE(setup_args)
 #define SETUP_BUFFER_SIZE 200
 static char setup_buffer[SETUP_BUFFER_SIZE];
 static char setup_used[MAX_SETUP_ARGS];