diff --git a/src/www/services_router_advertisements.php b/src/www/services_router_advertisements.php
index a435005b3..6aff61902 100644
--- a/src/www/services_router_advertisements.php
+++ b/src/www/services_router_advertisements.php
@@ -57,8 +57,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'GET') {
     // boolean
     $pconfig['rasamednsasdhcp6'] = isset($config['dhcpdv6'][$if]['rasamednsasdhcp6']);
     // arrays
-    $pconfig['radns1'] = !empty($config['dhcpdv6'][$if]['radnsserver'][0]) ? $config['dhcpdv6'][$if]['radnsserver'] : null;
-    $pconfig['radns2'] = !empty($config['dhcpdv6'][$if]['radnsserver'][1]) ? $config['dhcpdv6'][$if]['radnsserver'] : null;
+    $pconfig['radns1'] = !empty($config['dhcpdv6'][$if]['radnsserver'][0]) ? $config['dhcpdv6'][$if]['radnsserver'][0] : null;
+    $pconfig['radns2'] = !empty($config['dhcpdv6'][$if]['radnsserver'][1]) ? $config['dhcpdv6'][$if]['radnsserver'][1] : null;
 } elseif ($_SERVER['REQUEST_METHOD'] === 'POST') {
     if (!empty($_POST['if']) && !empty($config['interfaces'][$_POST['if']])) {
         $if = $_POST['if'];