cmd/progress.go | 12 ++++++++----

diff --git a/cmd/progress.go b/cmd/progress.go
index 61c43ee2601fc89e2ba15ddf750ce74223696e426a31f6eb9323a32b83b9fe21..0de96f4b3b7a7eac27f1676c5f2bdc90221baf732c79cd4d8d07890495f3fe1f 100644
--- a/cmd/progress.go
+++ b/cmd/progress.go
@@ -38,10 +38,14 @@ 	p.wrote += uint64(len(data))
 	p.now = time.Now()
 	if p.now.After(p.next) {
 		p.next = p.now.Add(ProgressPeriod)
-		fmt.Fprintf(os.Stderr, "%d%% | %s / %s\n",
-			int(100*p.wrote/p.total),
-			humanize.IBytes(p.wrote),
-			humanize.IBytes(p.total))
+		if p.total == 0 {
+			fmt.Fprintf(os.Stderr, "%s\n", humanize.IBytes(p.wrote))
+		} else {
+			fmt.Fprintf(os.Stderr, "%d%% | %s / %s\n",
+				int(100*p.wrote/p.total),
+				humanize.IBytes(p.wrote),
+				humanize.IBytes(p.total))
+		}
 	}
 	return
 }