storage/boltPieceCompletion.go | 3 +++

diff --git a/storage/boltPieceCompletion.go b/storage/boltPieceCompletion.go
index 36fc6c1fa1405ab6776c5897ba63b1e73759d7ec..4bc190a249d89fdcfa2a76269a6bc65ebb50f1fa 100644
--- a/storage/boltPieceCompletion.go
+++ b/storage/boltPieceCompletion.go
@@ -67,6 +67,9 @@ 	return
 }
 
 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 {
 		c, err := tx.CreateBucketIfNotExists(completionBucketKey)
 		if err != nil {