diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 9701963..bbeb8d1 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -37,7 +37,7 @@ define('WWW_ROOT', PLUGIN_ROOT . DS . 'webroot' . DS);
 define('TESTS', __DIR__ . DS);
 define('CONFIG', TESTS . 'config' . DS);
 
-ini_set('intl.default_locale', 'de-DE');
+ini_set('intl.default_locale', 'en-US');
 
 require PLUGIN_ROOT . '/vendor/autoload.php';
 require CORE_PATH . 'config/bootstrap.php';