diff --git a/mm/swapfile.c b/mm/swapfile.c
index a134d1e867957fb20bf9ed034f0f7e1effbd8354..cc2cf04d9018ad0c546648dfa6cb8167082bbc99 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -85,7 +85,7 @@ PLIST_HEAD(swap_active_head);
  * is held and the locking order requires swap_lock to be taken
  * before any swap_info_struct->lock.
  */
-struct plist_head *swap_avail_heads;
+static struct plist_head *swap_avail_heads;
 static DEFINE_SPINLOCK(swap_avail_lock);
 
 struct swap_info_struct *swap_info[MAX_SWAPFILES];