diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
index bc05b104eaed32768195b5537924303246a192f4..8faf472c430f927309f18460aed14cd2e14be3bc 100644
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -605,7 +605,7 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
 	 * enabled we continue, but stop the requeueing in the chain
 	 * walk.
 	 */
-	if (waiter->prio == task->prio) {
+	if (waiter->prio == task->prio && !dl_task(task)) {
 		if (!detect_deadlock)
 			goto out_unlock_pi;
 		else