diff --git a/ext/session/tests/session_hash_function_basic.phpt b/ext/session/tests/session_hash_function_basic.phpt
index 45b8bc0710a1f..663852d9d1a1c 100644
--- a/ext/session/tests/session_hash_function_basic.phpt
+++ b/ext/session/tests/session_hash_function_basic.phpt
@@ -2,6 +2,8 @@
 Test session.hash_function ini setting : basic functionality
 --SKIPIF--
 <?php include('skipif.inc'); ?>
+--INI--
+session.hash_bits_per_character=4
 --FILE--
 <?php