diff --git a/var/Typecho/Request.php b/var/Typecho/Request.php
index b4bfe2fc..49f46873 100644
--- a/var/Typecho/Request.php
+++ b/var/Typecho/Request.php
@@ -222,8 +222,7 @@ class Typecho_Request
                 self::$_urlPrefix == __TYPECHO_URL_PREFIX__;
             } else {
                 self::$_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)) ? '' : ':' . $_SERVER['SERVER_PORT']));
+                    . (isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : $_SERVER['SERVER_NAME']);
             }
         }