diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index e3565ec02401..e71e8440de6b 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4264,7 +4264,7 @@ static int __mem_cgroup_usage_register_event(struct mem_cgroup *memcg,
 	new->entries[size - 1].threshold = threshold;
 
 	/* Sort thresholds. Registering of new threshold isn't time-critical */
-	sort(new->entries, size, sizeof(struct mem_cgroup_threshold),
+	sort(new->entries, size, sizeof(*new->entries),
 			compare_thresholds, NULL);
 
 	/* Find current threshold */