diff --git a/mm/memcontrol-v1.c b/mm/memcontrol-v1.c
index 597b03ee9e35..8ca8dc3e3269 100644
--- a/mm/memcontrol-v1.c
+++ b/mm/memcontrol-v1.c
@@ -201,7 +201,7 @@ static unsigned long soft_limit_excess(struct mem_cgroup *memcg)
 	return excess;
 }
 
-void memcg1_update_tree(struct mem_cgroup *memcg, int nid)
+static void memcg1_update_tree(struct mem_cgroup *memcg, int nid)
 {
 	unsigned long excess;
 	struct mem_cgroup_per_node *mz;
diff --git a/mm/memcontrol-v1.h b/mm/memcontrol-v1.h
index 0a4d5092c51b..0337b407d1c2 100644
--- a/mm/memcontrol-v1.h
+++ b/mm/memcontrol-v1.h
@@ -5,7 +5,6 @@
 
 #include <linux/cgroup-defs.h>
 
-void memcg1_update_tree(struct mem_cgroup *memcg, int nid);
 void memcg1_remove_from_trees(struct mem_cgroup *memcg);
 
 static inline void memcg1_soft_limit_reset(struct mem_cgroup *memcg)