diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index d9ba9d5f99d6..c7963d5d0625 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -537,13 +537,13 @@ static void update_curr_rt(struct rq *rq)
 	for_each_sched_rt_entity(rt_se) {
 		rt_rq = rt_rq_of_se(rt_se);
 
-		spin_lock(&rt_rq->rt_runtime_lock);
 		if (sched_rt_runtime(rt_rq) != RUNTIME_INF) {
+			spin_lock(&rt_rq->rt_runtime_lock);
 			rt_rq->rt_time += delta_exec;
 			if (sched_rt_runtime_exceeded(rt_rq))
 				resched_task(curr);
+			spin_unlock(&rt_rq->rt_runtime_lock);
 		}
-		spin_unlock(&rt_rq->rt_runtime_lock);
 	}
 }