diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index 503ad954ccc0ba008357eb3abd07b3f49ea0ae51..d9481640b3e116b2ac4077ece7e94bca1c36c42e 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -286,7 +286,9 @@ STORE(__cached_dev)
 	sysfs_strtoul_clamp(writeback_rate_i_term_inverse,
 			    dc->writeback_rate_i_term_inverse,
 			    1, UINT_MAX);
-	d_strtoul_nonzero(writeback_rate_p_term_inverse);
+	sysfs_strtoul_clamp(writeback_rate_p_term_inverse,
+			    dc->writeback_rate_p_term_inverse,
+			    1, UINT_MAX);
 	d_strtoul_nonzero(writeback_rate_minimum);
 
 	sysfs_strtoul_clamp(io_error_limit, dc->error_limit, 0, INT_MAX);