diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index 482b128b3e9d8a6767134ba8e1f62ed02a5360c9..557a8a3270a16c5e6d0478a12ba5e1604f16d478 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -267,7 +267,8 @@ STORE(__cached_dev)
 	d_strtoul(writeback_running);
 	d_strtoul(writeback_delay);
 
-	sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent, 0, 40);
+	sysfs_strtoul_clamp(writeback_percent, dc->writeback_percent,
+			    0, bch_cutoff_writeback);
 
 	if (attr == &sysfs_writeback_rate) {
 		ssize_t ret;