diff --git a/common.php b/common.php
index c310a2e7..cc296feb 100644
--- a/common.php
+++ b/common.php
@@ -27,7 +27,7 @@ define('TIMENOW',   time());
 if (empty($_SERVER['REMOTE_ADDR']))     $_SERVER['REMOTE_ADDR'] = '127.0.0.1';
 if (empty($_SERVER['HTTP_USER_AGENT'])) $_SERVER['HTTP_USER_AGENT'] = '';
 if (empty($_SERVER['HTTP_REFERER']))    $_SERVER['HTTP_REFERER'] = '';
-if (empty($_SERVER['SERVER_NAME']))     $_SERVER['SERVER_NAME'] = '';
+if (empty($_SERVER['SERVER_NAME']))     $_SERVER['SERVER_NAME'] = getenv('SERVER_NAME');
 if (empty($_SERVER['SERVER_ADDR']))     $_SERVER['SERVER_ADDR'] = getenv('SERVER_ADDR');
 
 if (!defined('BB_ROOT')) define('BB_ROOT', './');