diff --git a/lib/classes/calendar/ICalendarImport.php b/lib/classes/calendar/ICalendarImport.php
index e78696d58fe4254855fae850b779ede07b1c6010..6ff7f80efc1fac793c35ee6461cffd5d0c3adf1b 100644
--- a/lib/classes/calendar/ICalendarImport.php
+++ b/lib/classes/calendar/ICalendarImport.php
@@ -368,7 +368,6 @@ class ICalendarImport
             $date->chdate = $date->mkdate;
         }
         $date->import_date = $this->import_time;
-        $date->unique_id = $properties['UID'];
 
         $this->setRecurrenceRule($date, $properties['RRULE']);
         $date->store();