diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 097ba02ac80979663c0c7b243859b1392dbf1251..591bc29b55f5acf0f8dbe97e360ddd279020e9b2 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -368,7 +368,7 @@ static void balloon_process(struct work_struct *work)
 }
 
 /* Resets the Xen limit, sets new target, and kicks off processing. */
-void balloon_set_new_target(unsigned long target)
+static void balloon_set_new_target(unsigned long target)
 {
 	/* No need for lock. Not read-modify-write updates. */
 	balloon_stats.hard_limit   = ~0UL;