diff --git a/bt/announce.php b/bt/announce.php
index 23662832d..8565c4aa3 100644
--- a/bt/announce.php
+++ b/bt/announce.php
@@ -94,7 +94,7 @@ if (!$bb_cfg['ignore_reported_ip'] && isset($_GET['ip']) && $ip !== $_GET['ip'])
     } elseif (isset($_SERVER['HTTP_X_FORWARDED_FOR']) && preg_match_all('#\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}#', $_SERVER['HTTP_X_FORWARDED_FOR'], $matches)) {
         foreach ($matches[0] as $x_ip) {
             if ($x_ip === $_GET['ip']) {
-                if (!$bb_cfg['allow_internal_ip'] && preg_match("#^(10|172\.16|192\.168)\.#", $x_ip)) {
+                if (!$bb_cfg['allow_internal_ip'] && preg_match("#(127\.([0-9]{1,3}\.){2}[0-9]{1,3}|10\.([0-9]{1,3}\.){2}[0-9]{1,3}|172\.[123][0-9]\.[0-9]{1,3}\.[0-9]{1,3}|192\.168\.[0-9]{1,3}\.[0-9]{1,3})#", $x_ip)) {
                     break;
                 }
                 $ip = $x_ip;