diff --git a/ext/phar/tests/phar_test.inc b/ext/phar/tests/phar_test.inc
index b4198127443..36ab85a29bb 100755
--- a/ext/phar/tests/phar_test.inc
+++ b/ext/phar/tests/phar_test.inc
@@ -1,5 +1,9 @@
 <?php
 
+if (function_exists('date_default_timezone_set')) {
+	date_default_timezone_set('UTC');
+}
+
 $manifest = '';
 $glags = 0;