diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 50df352b91fc2abb8ef8cd153172974f046b8993..b342a475860ba7c335c73ab94e19818aaf34615b 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -95,7 +95,7 @@ int do_swap_account __read_mostly;
 #define do_swap_account		0
 #endif
 
-struct workqueue_struct *memcg_wmark_wq;
+static struct workqueue_struct *memcg_wmark_wq;
 
 /* Whether legacy memory+swap accounting is active */
 static bool do_memsw_account(void)