diff --git a/Calendar/CalendarEvent.py b/Calendar/CalendarEvent.py
index 6ed8f84..fe57669 100644
--- a/Calendar/CalendarEvent.py
+++ b/Calendar/CalendarEvent.py
@@ -3,6 +3,7 @@ class CalendarEvent (object):
     def __init__ (self):
         self.begin_datetime = None
         self.end_datetime = None
+        self.all_day = None
 
         self.title = None
         self.description = None