diff --git a/mediaplayer/mediaplayer.py b/mediaplayer/mediaplayer.py
index fe4cc50..73a677f 100644
--- a/mediaplayer/mediaplayer.py
+++ b/mediaplayer/mediaplayer.py
@@ -10,9 +10,9 @@ def hhmmss(ms):
     # s = 1000
     # m = 60000
     # h = 360000
-    h, r = divmod(ms, 36000)
-    m, r = divmod(r, 60000)
-    s, _ = divmod(r, 1000)
+    s = round(ms / 1000)
+    m, s = divmod(s, 60)
+    h, m = divmod(m, 60)
     return ("%d:%02d:%02d" % (h,m,s)) if h else ("%d:%02d" % (m,s))
 
 class ViewerWindow(QMainWindow):