diff --git a/interface/lib/classes/plugin_backuplist.inc.php b/interface/lib/classes/plugin_backuplist.inc.php
index 4774eb6c49e309da6f967ace76c677da2b767b39..0b98dc9ec0b2c8a9a42ba11187a4962014243f8c 100644
--- a/interface/lib/classes/plugin_backuplist.inc.php
+++ b/interface/lib/classes/plugin_backuplist.inc.php
@@ -58,7 +58,7 @@ class plugin_backuplist extends plugin_base {
 		if ($tmp['number'] == 0) {
 			if($action_type === 'backup_database') {
 				// get all server ids of databases for this domain
-				$sql = 'SELECT distinct(`server_id`) FROM `web_database` WHERE `parent_domain_id` = ?';
+				$sql = 'SELECT DISTINCT `server_id` FROM `web_database` WHERE `parent_domain_id` = ?';
 				$result = $app->db->query($sql, $domain_id);
 				while(($cur = $result->get())) {
 					$server_id = $cur['server_id'];