diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index c4da2fe623e9e2b1c23ab2b7b083c72aed66b20a..4998b4cae9c11af3e6d258f0cb73fc29c37e9244 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1009,6 +1009,7 @@ static void cached_dev_detach_finish(struct work_struct *w)
 	bch_write_bdev_super(dc, &cl);
 	closure_sync(&cl);
 
+	calc_cached_dev_sectors(dc->disk.c);
 	bcache_device_detach(&dc->disk);
 	list_move(&dc->list, &uncached_devices);