diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index fc99e9241846..9198b7ade85f 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -892,8 +892,6 @@ static inline struct pglist_data *lruvec_pgdat(struct lruvec *lruvec)
 #endif
 }
 
-extern unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru, int zone_idx);
-
 #ifdef CONFIG_HAVE_MEMORYLESS_NODES
 int local_memory_node(int node_id);
 #else
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 348a90096550..fea6b43bc1f9 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -310,7 +310,8 @@ unsigned long zone_reclaimable_pages(struct zone *zone)
  * @lru: lru to use
  * @zone_idx: zones to consider (use MAX_NR_ZONES for the whole LRU list)
  */
-unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru, int zone_idx)
+static unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru,
+				     int zone_idx)
 {
 	unsigned long size = 0;
 	int zid;