diff --git a/cake/tests/lib/cake_test_suite_dispatcher.php b/cake/tests/lib/cake_test_suite_dispatcher.php
index d6bef5cd2..531448d7c 100644
--- a/cake/tests/lib/cake_test_suite_dispatcher.php
+++ b/cake/tests/lib/cake_test_suite_dispatcher.php
@@ -76,7 +76,7 @@ class CakeTestSuiteDispatcher {
  */
 	function CakeTestSuiteDispatcher() {
 		$this->_baseUrl = $_SERVER['PHP_SELF'];
-		$dir = dirname($this->_baseUrl);
+		$dir = rtrim(dirname($this->_baseUrl), '\\');
 		$this->_baseDir = ($dir === '/') ? $dir : $dir . '/';
 	}