diff --git a/gtk2_ardour/route_time_axis.cc b/gtk2_ardour/route_time_axis.cc
index 79edc98acb..a32f6b27df 100644
--- a/gtk2_ardour/route_time_axis.cc
+++ b/gtk2_ardour/route_time_axis.cc
@@ -426,7 +426,7 @@ RouteTimeAxisView::label_view ()
 	if (track_number == 0) {
 		number_label.set_text ("");
 	} else {
-		number_label.set_text (PBD::to_string (abs(_route->track_number ()), std::dec));
+		number_label.set_text (PBD::to_string (abs(_route->track_number ())));
 	}
 }