diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 2747f5e..9f8a97b 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3176,7 +3176,7 @@ static __init_refok int __build_all_zonelists(void *data)
  * Called with zonelists_mutex held always
  * unless system_state == SYSTEM_BOOTING.
  */
-void build_all_zonelists(void *data)
+void __ref build_all_zonelists(void *data)
 {
 	set_zonelist_order();