diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 88bae553ece3b5155e3b41a488d86cb9dd17ea5a..130854ad8cdb7830cd626dabb42f3b638e0d1dfe 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -4563,6 +4563,7 @@ static void cfq_exit_queue(struct elevator_queue *e)
 	kfree(cfqd->root_group);
 #endif
 	kfree(cfqd);
+	wbt_enable_default(q);
 }
 
 static int cfq_init_queue(struct request_queue *q, struct elevator_type *e)