diff --git a/unitTests/bootstrap.php b/unitTests/bootstrap.php
index 6fe28c83..8293b930 100644
--- a/unitTests/bootstrap.php
+++ b/unitTests/bootstrap.php
@@ -10,6 +10,8 @@
 
 chdir(dirname(__FILE__));
 
+setlocale(LC_ALL, 'en_US.utf8');
+
 // PHP 5.3 Compat
 date_default_timezone_set('Europe/London');