diff --git a/var/Typecho/Request.php b/var/Typecho/Request.php
index dc5309ee..8d710372 100644
--- a/var/Typecho/Request.php
+++ b/var/Typecho/Request.php
@@ -218,11 +218,9 @@ class Typecho_Request
     public static function getUrlPrefix()
     {
         if (empty(self::$_urlPrefix)) {
-            self::$_urlPrefix = (self::isSecure() ? 'https' : 'http') 
-                . '://' . (isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : 
-                    ($_SERVER['SERVER_NAME'] . (in_array($_SERVER['SERVER_PORT'], array(80, 443)) 
-                        ? '' : ':' . $_SERVER['SERVER_PORT']))
-                );
+            self::$_urlPrefix = (self::isSecure() ? 'https' : 'http') . '://' 
+                . (isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : $_SERVER['SERVER_NAME'])
+                . (empty($_SERVER['SERVER_PORT']) || in_array($_SERVER['SERVER_PORT'], array(80, 443)) ? '' : ':' . $_SERVER['SERVER_PORT']);
         }
 
         return self::$_urlPrefix;