diff --git a/includes/services/check_dns.inc.php b/includes/services/check_dns.inc.php
index 243cae5e83..fd709f70b7 100644
--- a/includes/services/check_dns.inc.php
+++ b/includes/services/check_dns.inc.php
@@ -4,7 +4,7 @@
 if ($service['service_param']) {
     $nsquery = $service['service_param'];
 } else {
-    $nsquery = 'localhost';
+    $nsquery = 'localhost.';
 }
 if ($service['service_ip']) {
     $resolver = $service['service_ip'];