diff --git a/common.php b/common.php
index ba387c86f..857c8a949 100644
--- a/common.php
+++ b/common.php
@@ -35,7 +35,7 @@ function g5_path()
     $port = $_SERVER['SERVER_PORT'] != 80 ? ':'.$_SERVER['SERVER_PORT'] : '';
     $http = 'http' . ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS']=='on') ? 's' : '') . '://';
     $user = str_replace(str_replace($document_root, '', $_SERVER['SCRIPT_FILENAME']), '', $_SERVER['SCRIPT_NAME']);
-    $result['url'] = $http.$_SERVER['HTTP_HOST'].$port.$user.$root;
+    $result['url'] = $http.(isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : $_SERVER['SERVER_NAME']).$port.$user.$root;
     return $result;
 }