diff --git a/ext/phar/tests/tar/phar_setsignaturealgo2.phpt b/ext/phar/tests/tar/phar_setsignaturealgo2.phpt
index c16e7523f88..b68bbf674c9 100644
--- a/ext/phar/tests/tar/phar_setsignaturealgo2.phpt
+++ b/ext/phar/tests/tar/phar_setsignaturealgo2.phpt
@@ -9,6 +9,9 @@ if (!in_array('SHA-256', $arr)) die("skip hash extension loaded shared"); ?>
 --INI--
 phar.require_hash=0
 phar.readonly=0
+--ENV--
+TEMP=.
+TMP=.
 --FILE--
 <?php
 $fname = dirname(__FILE__) . '/' . basename(__FILE__, '.php') . '.phar.tar';