diff --git a/memcached-api.php b/memcached-api.php
index 8ab03d4c..7e3e7733 100644
--- a/memcached-api.php
+++ b/memcached-api.php
@@ -269,9 +269,9 @@ public function getMulti( array $keys, $flags = 0) {}
 
 	public function getMultiByKey( $server_key, array $keys, $flags = 0) {}
 
-	public function getDelayed( array $keys, $with_cas = null, $value_cb = null ) {}
+	public function getDelayed( array $keys, $with_cas = false, $value_cb = null ) {}
 
-	public function getDelayedByKey( $server_key, array $keys, $with_cas = null, $value_cb = null ) {}
+	public function getDelayedByKey( $server_key, array $keys, $with_cas = false, $value_cb = null ) {}
 
 	public function fetch( ) {}
 
diff --git a/php_memcached.stub.php b/php_memcached.stub.php
index 6b84c5b7..fae18704 100644
--- a/php_memcached.stub.php
+++ b/php_memcached.stub.php
@@ -17,8 +17,8 @@ public function get(string $key, callable $cache_cb=NULL, int $get_flags=0): mix
 	public function getByKey(string $server_key, string $key, callable $cache_cb=NULL, int $get_flags=0): mixed {}
 	public function getMulti(array $keys, int $get_flags=0): false|array {}
 	public function getMultiByKey(string $server_key, array $keys, int $get_flags=0): false|array {}
-	public function getDelayed(array $keys, bool $with_cas=NULL, callable $value_cb=NULL): bool {}
-	public function getDelayedByKey(string $server_key, array $keys, bool $with_cas=NULL, callable $value_cb=NULL): bool {}
+	public function getDelayed(array $keys, bool $with_cas=false, callable $value_cb=NULL): bool {}
+	public function getDelayedByKey(string $server_key, array $keys, bool $with_cas=false, callable $value_cb=NULL): bool {}
 	public function fetch(): false|array {}
 	public function fetchAll(): false|array {}
 
diff --git a/php_memcached_arginfo.h b/php_memcached_arginfo.h
index 6b05cf4c..a5e90e4c 100644
--- a/php_memcached_arginfo.h
+++ b/php_memcached_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 8ce11ff45ccb2b1c765e5f313305f539ca3fa4f6 */
+ * Stub hash: a37775073c8863c1a4e4ea280a103beaacdf7305 */
 
 ZEND_BEGIN_ARG_INFO_EX(arginfo_class_Memcached___construct, 0, 0, 0)
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, persistent_id, IS_STRING, 0, "NULL")
@@ -39,14 +39,14 @@ ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_class_Memcached_getDelayed, 0, 1, _IS_BOOL, 0)
 	ZEND_ARG_TYPE_INFO(0, keys, IS_ARRAY, 0)
-	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, with_cas, _IS_BOOL, 0, "NULL")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, with_cas, _IS_BOOL, 0, "false")
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, value_cb, IS_CALLABLE, 0, "NULL")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_class_Memcached_getDelayedByKey, 0, 2, _IS_BOOL, 0)
 	ZEND_ARG_TYPE_INFO(0, server_key, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, keys, IS_ARRAY, 0)
-	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, with_cas, _IS_BOOL, 0, "NULL")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, with_cas, _IS_BOOL, 0, "false")
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, value_cb, IS_CALLABLE, 0, "NULL")
 ZEND_END_ARG_INFO()
 
diff --git a/php_memcached_legacy_arginfo.h b/php_memcached_legacy_arginfo.h
index c9426166..b6214956 100644
--- a/php_memcached_legacy_arginfo.h
+++ b/php_memcached_legacy_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 8ce11ff45ccb2b1c765e5f313305f539ca3fa4f6 */
+ * Stub hash: a37775073c8863c1a4e4ea280a103beaacdf7305 */
 
 ZEND_BEGIN_ARG_INFO_EX(arginfo_class_Memcached___construct, 0, 0, 0)
 	ZEND_ARG_INFO(0, persistent_id)