storage/bolt-piece-completion.go | 2 +-

diff --git a/storage/bolt-piece-completion.go b/storage/bolt-piece-completion.go
index 442f57c58da9a8788b8b71f8d6aec73552199665..026eb8a8c129de313440b963cbcec1ab77af54fc 100644
--- a/storage/bolt-piece-completion.go
+++ b/storage/bolt-piece-completion.go
@@ -71,7 +71,7 @@ func (me boltPieceCompletion) Set(pk metainfo.PieceKey, b bool) error {
 	if c, err := me.Get(pk); err == nil && c.Ok && c.Complete == b {
 		return nil
 	}
-	return me.db.Update(func(tx *bbolt.Tx) error {
+	return me.db.Batch(func(tx *bbolt.Tx) error {
 		c, err := tx.CreateBucketIfNotExists(completionBucketKey)
 		if err != nil {
 			return err