diff --git a/advanced/index.php b/advanced/index.php
index cad59ec7..f104bcf6 100644
--- a/advanced/index.php
+++ b/advanced/index.php
@@ -8,6 +8,8 @@
 
 // Sanitise HTTP_HOST output
 $serverName = htmlspecialchars($_SERVER["HTTP_HOST"]);
+// Remove external ipv6 brackets if any 
+$serverName = preg_replace('/^\[(.*)\]$/', '${1}', $serverName);
 
 if (!is_file("/etc/pihole/setupVars.conf"))
   die("[ERROR] File not found: <code>/etc/pihole/setupVars.conf</code>");