diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index af79bae..0d7852e 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -1400,6 +1400,7 @@
 	case PM_FAIL:
 		DMERR("%s: switching pool to failure mode",
 		      dm_device_name(pool->pool_md));
+		dm_pool_metadata_read_only(pool->pmd);
 		pool->process_bio = process_bio_fail;
 		pool->process_discard = process_bio_fail;
 		pool->process_prepared_mapping = process_prepared_mapping_fail;