diff --git a/application/Calendar/CalendarModel.php b/application/Calendar/CalendarModel.php
index 60a12487e..6ef796282 100644
--- a/application/Calendar/CalendarModel.php
+++ b/application/Calendar/CalendarModel.php
@@ -139,7 +139,7 @@ class CalendarModel
 
     public static function getCalendarEvents($me, $id = 0, $r = 0)
     {
-        $rrulefreq = array('daily' => 'DAILY', 'weekly' => 'WEEKLY', 'relativeMonthly' => 'MONTHLY', 'yearly' => 'YEARLY');
+        $rrulefreq = array('daily' => 'DAILY', 'weekly' => 'WEEKLY', 'relativeMonthly' => 'MONTHLY', 'yearly' => 'YEARLY', 'absoluteMonthly' => 'absoluteMonthly');
         $calendar = self::search(array("user_id" => $me));
         $standardCalendarColors = CalendarModel::$standardCalendarColors;
         $calendarColors = json_decode($calendar[0]->colors, true);