diff --git a/pandora_console/include/functions_agents.php b/pandora_console/include/functions_agents.php
index 6384d94cbe..16bdb974c6 100644
--- a/pandora_console/include/functions_agents.php
+++ b/pandora_console/include/functions_agents.php
@@ -922,7 +922,7 @@ function agents_get_group_agents (
 		}
 		
 		if (isset($search['id_os'])) {
-			$filter[] = "id_os = ". $search['id_os'];
+			$filter['id_os'] = $search['id_os'];
 		}
 		
 		if (isset($search['status'])) {