diff --git a/inc/ui/collection-edit.php b/inc/ui/collection-edit.php
index 515e471a..9e672295 100644
--- a/inc/ui/collection-edit.php
+++ b/inc/ui/collection-edit.php
@@ -357,7 +357,7 @@ label.privilege {
 </form>
 <script language="javascript">
 toggle_enabled('fld_is_calendar','=fld_timezone','=fld_schedule_transp','!fld_is_addressbook','=fld_ics_file');
-toggle_enabled('fld_is_addressbook','!fld_is_calendar');
+toggle_enabled('fld_is_addressbook','!fld_is_calendar','=fld_ics_file');
 toggle_visible('fld_use_default_privs','!privileges_settings');
 </script>