diff --git a/www/manager6/panel/BackupAdvancedOptions.js b/www/manager6/panel/BackupAdvancedOptions.js
index fe8cc3b..54a995d 100644
--- a/www/manager6/panel/BackupAdvancedOptions.js
+++ b/www/manager6/panel/BackupAdvancedOptions.js
@@ -122,6 +122,7 @@ Ext.define('PVE.panel.BackupAdvancedOptions', {
             startColumn: {
                 xtype: 'pmxDisplayEditField',
                 vtype: 'ConfigId',
+                maxLength: 50,
                 fieldLabel: gettext('Job ID'),
                 emptyText: gettext('Autogenerate'),
                 name: 'id',