diff --git a/mm/vmscan.c b/mm/vmscan.c
index e147138..cb474cc 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1282,7 +1282,7 @@
 	 */
 	if (priority < 0)
 		priority = 0;
-	for (i = 0; zones[i] != 0; i++) {
+	for (i = 0; zones[i] != NULL; i++) {
 		struct zone *zone = zones[i];
 
 		if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL))