diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
index c3484785b17958df85b11ca2823a1f4a4d41f59b..0e97ca9306efc164ada86b6c6bd73506bfdb706e 100644
--- a/kernel/sched/psi.c
+++ b/kernel/sched/psi.c
@@ -322,7 +322,7 @@ static bool update_stats(struct psi_group *group)
 	expires = group->next_update;
 	if (now < expires)
 		goto out;
-	if (now - expires > psi_period)
+	if (now - expires >= psi_period)
 		missed_periods = div_u64(now - expires, psi_period);
 
 	/*