diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index f0f831e8a345d835f4cb21bf899c50ab67042b43..62671f53202ac7d4de8037dce950c934c7a4ddbc 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3034,6 +3034,8 @@ void rt_mutex_setprio(struct task_struct *p, int prio)
 	} else {
 		if (dl_prio(oldprio))
 			p->dl.dl_boosted = 0;
+		if (rt_prio(oldprio))
+			p->rt.timeout = 0;
 		p->sched_class = &fair_sched_class;
 	}