diff --git a/xen/common/sched/rt.c b/xen/common/sched/rt.c
index f368e0fdd5..7b1f64a779 100644
--- a/xen/common/sched/rt.c
+++ b/xen/common/sched/rt.c
@@ -500,7 +500,7 @@ deadline_queue_remove(struct list_head *queue, struct list_head *elem)
 }
 
 static inline bool
-deadline_queue_insert(struct rt_unit * (*qelem)(struct list_head *),
+deadline_queue_insert(struct rt_unit * (*qelem)(struct list_head *elem),
                       struct rt_unit *svc, struct list_head *elem,
                       struct list_head *queue)
 {