diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
index ce7374926c225a3a0f612aac9eb632bd372a991c..01e7fb4f7aada88bb5c1778b91fd81b5e1ead1d5 100644
--- a/kernel/sched/psi.c
+++ b/kernel/sched/psi.c
@@ -186,7 +186,8 @@ static void group_init(struct psi_group *group)
 
 	for_each_possible_cpu(cpu)
 		seqcount_init(&per_cpu_ptr(group->pcpu, cpu)->seq);
-	group->avg_next_update = sched_clock() + psi_period;
+	group->avg_last_update = sched_clock();
+	group->avg_next_update = group->avg_last_update + psi_period;
 	INIT_DELAYED_WORK(&group->avgs_work, psi_avgs_work);
 	mutex_init(&group->avgs_lock);
 	/* Init trigger-related members */