diff --git a/drivers/md/md.c b/drivers/md/md.c
index 6658513..3194a80 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3126,7 +3126,7 @@
 		char nm[20];
 		if (rdev->raid_disk < 0)
 			continue;
-		if (rdev->new_raid_disk > mddev->raid_disks)
+		if (rdev->new_raid_disk >= mddev->raid_disks)
 			rdev->new_raid_disk = -1;
 		if (rdev->new_raid_disk == rdev->raid_disk)
 			continue;