reader.go  | 5 +++--
 torrent.go | 3 ++-

diff --git a/reader.go b/reader.go
index 648228be423fa2417e81bb9e36db4b02f0aca52e..24403dc17f75f06a0b588c403c0337323820fb4c 100644
--- a/reader.go
+++ b/reader.go
@@ -226,8 +226,9 @@ 		// TODO: Just reset pieces in the readahead window. This might help
 		// prevent thrashing with small caches and file and piece priorities.
 		log.Printf("error reading torrent %s piece %d offset %d, %d bytes: %v",
 			r.t.infoHash.HexString(), pi, po, len(b1), err)
-		r.t.updateAllPieceCompletions()
-		r.t.updateAllPiecePriorities()
+		if !r.t.updatePieceCompletion(pi) {
+			log.Printf("piece %d completion unchanged", pi)
+		}
 		r.t.cl.unlock()
 	}
 }
diff --git a/torrent.go b/torrent.go
index c9ccaa9f042531d300f3aacf2234905caa134a83..4a519d346d408a29b5d842cabee9886f88bcfd16 100644
--- a/torrent.go
+++ b/torrent.go
@@ -1054,7 +1054,7 @@ 	t.connPieceInclinationPool.Put(&pi)
 	pieceInclinationsPut.Add(1)
 }
 
-func (t *Torrent) updatePieceCompletion(piece pieceIndex) {
+func (t *Torrent) updatePieceCompletion(piece pieceIndex) bool {
 	pcu := t.pieceCompleteUncached(piece)
 	p := &t.pieces[piece]
 	changed := t.completedPieces.Get(bitmap.BitIndex(piece)) != pcu.Complete || p.storageCompletionOk != pcu.Ok
@@ -1067,6 +1067,7 @@ 	// t.logger.Printf("piece %d changed: %v", piece, changed)
 	if changed {
 		t.pieceCompletionChanged(piece)
 	}
+	return changed
 }
 
 // Non-blocking read. Client lock is not required.