--- a/web/views/old_calendar.py	Thu Jan 20 17:14:28 2011 +0100
+++ b/web/views/old_calendar.py	Fri Jan 21 11:48:19 2011 +0100
@@ -32,6 +32,7 @@
 
 class ICalendarViewsAdapter(EntityAdapter):
     """calendar views interface"""
+    __needs_bw_compat__ = True
     __regid__ = 'ICalendarViews'
     __select__ = implements(ICalendarViews, warn=False) # XXX for bw compat, should be abstract