diff --git a/src/Symfony/Bridge/PhpUnit/Tests/expectrisky.phpt b/src/Symfony/Bridge/PhpUnit/Tests/expectrisky.phpt
index 9efbb98e07..608c564889 100644
--- a/src/Symfony/Bridge/PhpUnit/Tests/expectrisky.phpt
+++ b/src/Symfony/Bridge/PhpUnit/Tests/expectrisky.phpt
@@ -1,5 +1,7 @@
 --TEST--
 Test NoAssertionsTestRisky risky test
+--SKIPIF--
+<?php if ('\\' === DIRECTORY_SEPARATOR && !extension_loaded('mbstring')) die('Skipping on Windows without mbstring');
 --FILE--
 <?php
 $test =  realpath(__DIR__.'/FailTests/NoAssertionsTestRisky.php');