diff --git a/deluge/ui/gtkui/aboutdialog.py b/deluge/ui/gtkui/aboutdialog.py
index ff347458c..e49523f20 100644
--- a/deluge/ui/gtkui/aboutdialog.py
+++ b/deluge/ui/gtkui/aboutdialog.py
@@ -29,7 +29,8 @@ class AboutDialog:
 
         version = get_version()
 
-        self.about.set_copyright(_("Copyright %s-%s Deluge Team") % (2007, 2014))
+        self.about.set_copyright(
+            _("Copyright %(year_start)s-%(year_end)s Deluge Team") % {"year_start": 2007, "year_end": 2015})
         self.about.set_comments(
             _("A peer-to-peer file sharing program\nutilizing the BitTorrent protocol.")
             + "\n\n" + _("Client:") + " %s\n" % version)