diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 5161000eec0a6d42de753ce034b26ee0529c7f86..2ba167b9d187ee81458e7c84e5cc3f6e1a5042cf 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -549,7 +549,8 @@ static int se_is_idle(struct sched_entity *se)
 
 int task_is_idle(struct task_struct *p)
 {
-	return task_has_idle_policy(p) || cfs_rq_is_idle(group_cfs_rq(&p->se));
+	return (p->sched_class == &fair_sched_class) &&
+		(task_has_idle_policy(p) || cfs_rq_is_idle(cfs_rq_of(&p->se)));
 }
 
 static __always_inline