cmd/dl.go | 10 +++++++++-

diff --git a/cmd/dl.go b/cmd/dl.go
index 39c59797f5a190516d93de554b494cccc7bd961456830245cfbca3f83560974c..f275de0bf95e91989d105753f383527ea72ee034d56719adf277116a095dbfd8 100644
--- a/cmd/dl.go
+++ b/cmd/dl.go
@@ -64,9 +64,17 @@ 	}
 	if resp.StatusCode != http.StatusOK {
 		log.Fatalln("status code:", resp.Status)
 	}
+	var sizeExpected uint64
+	if *size == 0 {
+		if resp.ContentLength > 0 {
+			sizeExpected = uint64(resp.ContentLength)
+		}
+	} else {
+		sizeExpected = uint64(*size)
+	}
 	var w io.Writer
 	if *progress {
-		bar := Progress{w: os.Stdout, now: time.Now(), total: uint64(*size)}
+		bar := Progress{w: os.Stdout, now: time.Now(), total: sizeExpected}
 		bar.next = bar.now.Add(ProgressPeriod)
 		w = &bar
 	} else {