diff --git a/Calendar/CalendarEvent.py b/Calendar/CalendarEvent.py
index f194d94..7c88d75 100644
--- a/Calendar/CalendarEvent.py
+++ b/Calendar/CalendarEvent.py
@@ -5,6 +5,8 @@ class CalendarEvent (object):
         self.end_datetime = None
         self.duration = None
         self.allday = None
+
+        self.rstart = None
         self.rrule = None
 
         self.title = None