diff --git a/src/p3k/HTTP/Test.php b/src/p3k/HTTP/Test.php
index 37219ef..3efa2d8 100644
--- a/src/p3k/HTTP/Test.php
+++ b/src/p3k/HTTP/Test.php
@@ -33,7 +33,7 @@ class Test implements Transport {
     $this->_redirects_remaining = $this->_max_redirects;
     $parts = parse_url($url);
     unset($parts['fragment']);
-    $url = \build_url($parts);
+    $url = self::_build_url($parts);
     return $this->_read_file($url);
   }
 
@@ -57,7 +57,7 @@ class Test implements Transport {
     $parts = parse_url($url);
     if($parts['path']) {
       $parts['path'] = '/'.str_replace('/','_',substr($parts['path'],1));
-      $url = \build_url($parts);
+      $url = self::_build_url($parts);
     }
 
     $filename = $this->_testDataPath.preg_replace('/https?:\/\//', '', $url);
@@ -135,4 +135,17 @@ class Test implements Transport {
     return $retVal;
   }
 
+  private static function _build_url($parsed_url) {
+    $scheme   = isset($parsed_url['scheme']) ? $parsed_url['scheme'] . '://' : '';
+    $host     = isset($parsed_url['host']) ? $parsed_url['host'] : '';
+    $port     = isset($parsed_url['port']) ? ':' . $parsed_url['port'] : '';
+    $user     = isset($parsed_url['user']) ? $parsed_url['user'] : '';
+    $pass     = isset($parsed_url['pass']) ? ':' . $parsed_url['pass']  : '';
+    $pass     = ($user || $pass) ? "$pass@" : '';
+    $path     = isset($parsed_url['path']) ? $parsed_url['path'] : '';
+    $query    = isset($parsed_url['query']) ? '?' . $parsed_url['query'] : '';
+    $fragment = isset($parsed_url['fragment']) ? '#' . $parsed_url['fragment'] : '';
+    return "$scheme$user$pass$host$port$path$query$fragment";
+  }
+
 }