diff --git a/mm/vmstat.c b/mm/vmstat.c
index 98855f31294d..f226942db746 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -778,17 +778,20 @@ static int fold_diff(int *zone_diff, int *node_diff)
 	int i;
 	bool changed = false;
 
-	for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
+	for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) {
 		if (zone_diff[i]) {
 			atomic_long_add(zone_diff[i], &vm_zone_stat[i]);
 			changed = true;
+		}
 	}
 
-	for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
+	for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
 		if (node_diff[i]) {
 			atomic_long_add(node_diff[i], &vm_node_stat[i]);
 			changed = true;
+		}
 	}
+
 	return changed;
 }