diff --git a/calendar/templates/default/app.css b/calendar/templates/default/app.css
index ca266d9d23..487b49a6bc 100644
--- a/calendar/templates/default/app.css
+++ b/calendar/templates/default/app.css
@@ -675,4 +675,8 @@ img.calendar_print_button, img.calendar_print_appicon {
 .calendar_favorite_portlet .calendar_calDayColHeader a img,
 .calendar_favorite_portlet .calendar_plannerScale a img{
 	display: none;
+}
+
+#calendar-edit select#calendar-edit_duration {
+	width: 133px;
 }
\ No newline at end of file