diff --git a/admin/settings/appearance.php b/admin/settings/appearance.php
index 8c5616d9853..c7f52cd4b47 100644
--- a/admin/settings/appearance.php
+++ b/admin/settings/appearance.php
@@ -45,7 +45,7 @@ if ($hassiteconfig) { // speedup for non-admins, add all caps used on this page
     $temp->add(new admin_setting_configtext('calendar_lookahead',get_string('configlookahead','admin'),get_string('helpupcominglookahead', 'admin'),21,PARAM_INT));
     $temp->add(new admin_setting_configtext('calendar_maxevents',get_string('configmaxevents','admin'),get_string('helpupcomingmaxevents', 'admin'),10,PARAM_INT));
     $temp->add(new admin_setting_configcheckbox('enablecalendarexport', get_string('enablecalendarexport', 'admin'), get_string('configenablecalendarexport','admin'), 1));
-    $temp->add(new admin_setting_configtext('calendar_exportsalt', get_string('calendarexportsalt','admin'), get_string('configcalendarexportsalt', 'admin'), random_string(40)));
+    $temp->add(new admin_setting_configtext('calendar_exportsalt', get_string('calendarexportsalt','admin'), get_string('configcalendarexportsalt', 'admin'), random_string(60)));
     $ADMIN->add('appearance', $temp);
 
     // "htmleditor" settingpage