Index: SoObjects/Appointments/SOGoComponentOccurence.m
--- SoObjects/Appointments/SOGoComponentOccurence.m.orig
+++ SoObjects/Appointments/SOGoComponentOccurence.m
@@ -159,7 +159,7 @@
   else
     {
       if ([container respondsToSelector: @selector (prepareDeleteOccurence:)])
-	[container prepareDeleteOccurence: component];
+	[container prepareDeleteOccurence: (iCalEvent*) component];
 
       recurrenceId = [component recurrenceId];
 
