diff --git a/drivers/xen/xen-balloon.c b/drivers/xen/xen-balloon.c
index 3832e303c33aca5ceabf0bb1540e02a28b7765bc..596e6a7b17d68bc3ebf424cc11344da1cc32f1e5 100644
--- a/drivers/xen/xen-balloon.c
+++ b/drivers/xen/xen-balloon.c
@@ -221,7 +221,7 @@ static int register_balloon(struct device *dev)
 {
 	int i, error;
 
-	error = bus_register(&balloon_subsys);
+	error = subsys_system_register(&balloon_subsys, NULL);
 	if (error)
 		return error;