diff --git a/docker/roundcube/rootfs/opt/app-root/src/roundcubemail-config-templates/calendar.inc.php b/docker/roundcube/rootfs/opt/app-root/src/roundcubemail-config-templates/calendar.inc.php
index e4bff23b..720c4cc7 100644
--- a/docker/roundcube/rootfs/opt/app-root/src/roundcubemail-config-templates/calendar.inc.php
+++ b/docker/roundcube/rootfs/opt/app-root/src/roundcubemail-config-templates/calendar.inc.php
@@ -1,32 +1,33 @@
 <?php
     $config['calendar_driver'] = "caldav";
     $config['calendar_default_view'] = "agendaWeek";
     $config['calendar_timeslots'] = 2;
     $config['calendar_first_day'] = 1;
     $config['calendar_first_hour'] = 6;
     $config['calendar_work_start'] = 6;
     $config['calendar_work_end'] = 18;
     $config['calendar_event_coloring'] = 0;
     # This is for external access
     $config['calendar_caldav_url'] = 'https://%h/dav/calendars/%u/%i';
     # This is for internal access
     $config['calendar_caldav_server'] = getenv('CALENDAR_CALDAV_SERVER') ?: "https://" . ($_SERVER["HTTP_HOST"] ?? null) . "/dav";
 
     $config['calendar_itip_smtp_server'] = '';
     $config['calendar_itip_smtp_user'] = '';
     $config['calendar_itip_smtp_pass'] = '';
 
     $config['calendar_itip_send_option'] = 3;
     $config['calendar_itip_after_action'] = 0;
 
     $config['calendar_freebusy_trigger'] = false;
 
-    $config['kolab_invitation_calendars'] = true;
+    # FIXME: needs to be fixed with the dav backend
+    $config['kolab_invitation_calendars'] = false;
 
     $config['calendar_contact_birthdays'] = true;
 
     if (file_exists(RCUBE_CONFIG_DIR . '/' . ($_SERVER["HTTP_HOST"] ?? null) . '/' . basename(__FILE__))) {
         include_once(RCUBE_CONFIG_DIR . '/' . ($_SERVER["HTTP_HOST"] ?? null) . '/' . basename(__FILE__));
     }
 
 ?>