diff --git a/config/zentaopms.php b/config/zentaopms.php
index 31d0b2a51b..a97a6d47a3 100644
--- a/config/zentaopms.php
+++ b/config/zentaopms.php
@@ -221,6 +221,7 @@ $config->openMethods[] = 'kanban.finishcard';
 $config->openMethods[] = 'kanban.deleteobjectcard';
 $config->openMethods[] = 'admin.ignore';
 $config->openMethods[] = 'personnel.unbindwhitelist';
+$config->openMethods[] = 'tree.viewhistory';
 
 /* Define the tables. */
 define('TABLE_COMPANY',       '`' . $config->db->prefix . 'company`');