diff --git a/includes/discovery/services.inc.php b/includes/discovery/services.inc.php
index dba86bd2e9..ebd4a66e88 100644
--- a/includes/discovery/services.inc.php
+++ b/includes/discovery/services.inc.php
@@ -31,7 +31,7 @@ if (Config::get('discover_services')) {
         }
     }
     foreach (dbFetchRows('SELECT * FROM `device_groups` ORDER BY `name`') as $device_group) {
-        foreach (dbFetchRows('SELECT * FROM `services_template` WHERE `device_group_id` = ?', [$device_group[device_group_id]]) as $service_template) {
+        foreach (dbFetchRows('SELECT * FROM `services_template` WHERE `device_group_id` = ?', [$device_group['device_group_id']]) as $service_template) {
             discover_service_template($device_group['device_group_id'], $service_template['service_template_id']);
         }
     }