diff --git a/ext/standard/tests/general_functions/gh20840.phpt b/ext/standard/tests/general_functions/gh20840.phpt
index 99df478c1f265..35d72cf0fb5d5 100644
--- a/ext/standard/tests/general_functions/gh20840.phpt
+++ b/ext/standard/tests/general_functions/gh20840.phpt
@@ -12,7 +12,7 @@ if (getenv('SKIP_ASAN')) {
 }
 ?>
 --INI--
-zend.max_allowed_stack_size=128K
+zend.max_allowed_stack_size=256K
 --FILE--
 <?php
 class Node {