diff --git a/ext/phar/tests/phar_convert_tar2.phpt b/ext/phar/tests/phar_convert_tar2.phpt
index db26aae0f02..4b561ba43d2 100644
--- a/ext/phar/tests/phar_convert_tar2.phpt
+++ b/ext/phar/tests/phar_convert_tar2.phpt
@@ -33,7 +33,7 @@ var_dump($phar->isTar());
 var_dump($phar->isCompressed());
 var_dump($phar->getStub());
 
-copy($fname2, $fname3);
+copy($fname2 . '.gz', $fname3);
 
 $phar = new Phar($fname3);
 var_dump($phar->isTar());
diff --git a/ext/phar/tests/phar_convert_tar3.phpt b/ext/phar/tests/phar_convert_tar3.phpt
index 60885075dae..c4d58f728db 100644
--- a/ext/phar/tests/phar_convert_tar3.phpt
+++ b/ext/phar/tests/phar_convert_tar3.phpt
@@ -33,7 +33,7 @@ var_dump($phar->isTar());
 var_dump($phar->isCompressed());
 var_dump($phar->getStub());
 
-copy($fname2, $fname3);
+copy($fname2 . '.bz2', $fname3);
 
 $phar = new Phar($fname3);
 var_dump($phar->isTar());