Suppress PHP 5.6 E_DEPRECATED warnings for mbstring.internal_encoding as well
diff --git a/tests/Bootstrap.php b/tests/Bootstrap.php
index 195fc0d..cc84abf 100644
--- a/tests/Bootstrap.php
+++ b/tests/Bootstrap.php
@@ -46,7 +46,7 @@
 if (extension_loaded('mbstring'))
 {
 	defined('MB_ENABLED') OR define('MB_ENABLED', TRUE);
-	ini_set('mbstring.internal_encoding', 'UTF-8');
+	@ini_set('mbstring.internal_encoding', 'UTF-8');
 	mb_substitute_character('none');
 }
 else