diff --git a/common.php b/common.php
index 608a779ac..da867ec16 100644
--- a/common.php
+++ b/common.php
@@ -32,10 +32,11 @@ function g5_path()
     $result['path'] = str_replace('\\', '/', dirname(__FILE__));
     $tilde_remove = preg_replace('/^\/\~[^\/]+(.*)$/', '$1', $_SERVER['SCRIPT_NAME']);
     $document_root = str_replace($tilde_remove, '', $_SERVER['SCRIPT_FILENAME']);
-    $root = str_replace($document_root, '', $result['path']);
+    $pattern = '/' . preg_quote($document_root, '/') . '/i';
+    $root = preg_replace($pattern, '', $result['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']);
+    $user = str_replace(preg_replace($pattern, '', $_SERVER['SCRIPT_FILENAME']), '', $_SERVER['SCRIPT_NAME']);
     $host = isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : $_SERVER['SERVER_NAME'];
     if(isset($_SERVER['HTTP_HOST']) && preg_match('/:[0-9]+$/', $host))
         $host = preg_replace('/:[0-9]+$/', '', $host);