diff --git a/ext/session/tests/session_regenerate_id_cookie.phpt b/ext/session/tests/session_regenerate_id_cookie.phpt
index f2375b253ed..f1dc0727205 100644
--- a/ext/session/tests/session_regenerate_id_cookie.phpt
+++ b/ext/session/tests/session_regenerate_id_cookie.phpt
@@ -2,6 +2,8 @@
 Test session_regenerate_id() function : basic functionality
 --EXTENSIONS--
 session
+--INI--
+session.sid_length = 32
 --SKIPIF--
 <?php