diff --git a/tests/Math/BigIntegerTest.php b/tests/Math/BigIntegerTest.php
index ad0badbc..2559fa51 100644
--- a/tests/Math/BigIntegerTest.php
+++ b/tests/Math/BigIntegerTest.php
@@ -5,8 +5,6 @@
  * @license    http://www.opensource.org/licenses/mit-license.html  MIT License
  */
 
-require('Math/BigInteger.php');
-
 class BigIntegerTest extends PHPUnit_Framework_TestCase
 {
 	public function getInstance($x = 0, $base = 10)
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 35c9427f..eb7136b8 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -11,3 +11,12 @@ set_include_path(implode(PATH_SEPARATOR, array(
 	dirname(__FILE__) . '/../phpseclib/',
 	get_include_path(),
 )));
+
+function phpseclib_autoload($class)
+{
+	$file = str_replace('_', '/', $class) . '.php';
+
+	require $file;
+}
+
+spl_autoload_register('phpseclib_autoload');