diff --git a/main.go b/main.go
index 4ef7de0..e25f289 100644
--- a/main.go
+++ b/main.go
@@ -428,5 +428,5 @@ func formatDuration(d time.Duration) string {
 	h := d / time.Hour
 	d -= h * time.Hour
 	m := d / time.Minute
-	return fmt.Sprintf("%02d:%02d", h, m)
+	return fmt.Sprintf("%02dh%02dm", h, m)
 }