diff --git a/server/lib/classes/cron.d/500-backup.inc.php b/server/lib/classes/cron.d/500-backup.inc.php
index fc0619ee87430d800b75013ae4e9f47e2d7b4d95..3f4e6b5e46ebcc31b54256afd184e51f390b7d51 100644
--- a/server/lib/classes/cron.d/500-backup.inc.php
+++ b/server/lib/classes/cron.d/500-backup.inc.php
@@ -209,7 +209,7 @@ class cronjob_backup extends cronjob {
 				$records = $app->db->queryAllRecords("SELECT * FROM web_database WHERE server_id = ? AND backup_interval != 'none' AND backup_interval != ''", $conf['server_id']);
 				if(is_array($records)) {
 
-					include 'lib/mysql_clientdb.conf';
+					include '/usr/local/ispconfig/server/lib/mysql_clientdb.conf';
 
 					foreach($records as $rec) {