client_test.go |  2 +-
 torrent.go     | 24 +++++++++++++-----------

diff --git a/client_test.go b/client_test.go
index b84b9f3b9f41e38c0c529d86f87347de2d33017c..18288e4eb678ca2939c71d0ba48a4613b284976c 100644
--- a/client_test.go
+++ b/client_test.go
@@ -106,7 +106,7 @@ func TestTorrentInitialState(t *testing.T) {
 	dir, mi := testutil.GreetingTestTorrent()
 	defer os.RemoveAll(dir)
 	cl := &Client{
-		config: &ClientConfig{},
+		config: TestingConfig(),
 	}
 	cl.initLogger()
 	tor := cl.newTorrent(
diff --git a/torrent.go b/torrent.go
index 5fd2bbff3df2ef6a365459333bc188814e777a13..02ee63af9d4b21ae1f12ca4124162a70b1b88d81 100644
--- a/torrent.go
+++ b/torrent.go
@@ -735,7 +735,7 @@ }
 
 func (t *Torrent) hashPiece(piece pieceIndex) (ret metainfo.Hash) {
 	hash := pieceHash.New()
-	p := &t.pieces[piece]
+	p := t.piece(piece)
 	p.waitNoPendingWrites()
 	ip := t.info.Piece(int(piece))
 	pl := ip.Length()
@@ -997,7 +997,7 @@ 	t.pieces[req.Index].pendChunkIndex(ci)
 }
 
 func (t *Torrent) pieceCompletionChanged(piece pieceIndex) {
-	log.Call().Add("piece", piece).AddValue(debugLogValue).Log(t.logger)
+	t.tickleReaders()
 	t.cl.event.Broadcast()
 	if t.pieceComplete(piece) {
 		t.onPieceCompleted(piece)
@@ -1056,16 +1056,14 @@ 	pieceInclinationsPut.Add(1)
 }
 
 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
-	log.Fmsg("piece %d completion: %v", piece, pcu.Ok).AddValue(debugLogValue).Log(t.logger)
-	p.storageCompletionOk = pcu.Ok
-	t.completedPieces.Set(bitmap.BitIndex(piece), pcu.Complete)
-	t.tickleReaders()
-	// t.logger.Printf("piece %d uncached completion: %v", piece, pcu.Complete)
-	// t.logger.Printf("piece %d changed: %v", piece, changed)
+	p := t.piece(piece)
+	uncached := t.pieceCompleteUncached(piece)
+	cached := p.completion()
+	changed := cached != uncached
+	p.storageCompletionOk = uncached.Ok
+	t.completedPieces.Set(bitmap.BitIndex(piece), uncached.Complete)
 	if changed {
+		t.logger.Log(log.Fstr("piece %d completion changed: %+v -> %+v", piece, cached, uncached))
 		t.pieceCompletionChanged(piece)
 	}
 	return changed
@@ -1721,3 +1719,7 @@
 func (t *Torrent) dialTimeout() time.Duration {
 	return reducedDialTimeout(t.cl.config.MinDialTimeout, t.cl.config.NominalDialTimeout, t.cl.config.HalfOpenConnsPerTorrent, t.peers.Len())
 }
+
+func (t *Torrent) piece(i int) *Piece {
+	return &t.pieces[i]
+}