diff --git a/progress.go b/progress.go
index 55af3c9..8a8f1bd 100644
--- a/progress.go
+++ b/progress.go
@@ -254,7 +254,7 @@
 
 func (s *pState) flush(cw *cwriter.Writer, height int) error {
 	var popCount int
-	rows := make([]io.Reader, 0, s.bHeap.Len())
+	rows := make([]io.Reader, 0, height)
 	pool := make([]*Bar, 0, s.bHeap.Len())
 	for s.bHeap.Len() > 0 {
 		var frameRowsUsed int