diff --git a/addons/base_calendar/wizard/base_calendar_invite_attendee.py b/addons/base_calendar/wizard/base_calendar_invite_attendee.py
index ea4d5aca85f..59bde615645 100644
--- a/addons/base_calendar/wizard/base_calendar_invite_attendee.py
+++ b/addons/base_calendar/wizard/base_calendar_invite_attendee.py
@@ -140,7 +140,7 @@ send an Email to Invited Person')
                 if not mail_to:
                     name =  map(lambda x: x[1], filter(lambda x: type==x[0], \
                                        self._columns['type'].selection))
-                    raise osv.except_osv(_('Error!'), ("%s must have an email  Address to send mail") %(name[0]))
+                    raise osv.except_osv(_('Error!'), ("%s must have an email  address to send mail") %(name[0]))
                 att_obj._send_mail(cr, uid, attendees, mail_to, \
                        email_from = current_user.user_email or tools.config.get('email_from', False))