diff --git a/ext/xml/php_xml.h b/ext/xml/php_xml.h
index 239028f71fdf4..e01a0264df9e8 100644
--- a/ext/xml/php_xml.h
+++ b/ext/xml/php_xml.h
@@ -46,4 +46,10 @@ enum php_xml_option {
 	PHP_XML_OPTION_SKIP_WHITE
 };
 
+#ifdef LIBXML_EXPAT_COMPAT
+#define PHP_XML_SAX_IMPL "libxml"
+#else
+#define PHP_XML_SAX_IMPL "expat"
+#endif
+
 #endif /* PHP_XML_H */
diff --git a/ext/xml/xml.c b/ext/xml/xml.c
index 5dbb91c26f8df..d8985ed6e78bd 100644
--- a/ext/xml/xml.c
+++ b/ext/xml/xml.c
@@ -264,12 +264,6 @@ PHP_MINIT_FUNCTION(xml)
 	php_xml_mem_hdlrs.realloc_fcn = php_xml_realloc_wrapper;
 	php_xml_mem_hdlrs.free_fcn = php_xml_free_wrapper;
 
-#ifdef LIBXML_EXPAT_COMPAT
-	REGISTER_STRING_CONSTANT("XML_SAX_IMPL", "libxml", CONST_CS|CONST_PERSISTENT);
-#else
-	REGISTER_STRING_CONSTANT("XML_SAX_IMPL", "expat", CONST_CS|CONST_PERSISTENT);
-#endif
-
 	return SUCCESS;
 }
 
diff --git a/ext/xml/xml.stub.php b/ext/xml/xml.stub.php
index b650e0cc538a5..e0b6386bf7705 100644
--- a/ext/xml/xml.stub.php
+++ b/ext/xml/xml.stub.php
@@ -134,6 +134,12 @@
  */
 const XML_OPTION_SKIP_WHITE = UNKNOWN;
 
+/**
+ * @var string
+ * @cvalue PHP_XML_SAX_IMPL
+ */
+const XML_SAX_IMPL = UNKNOWN;
+
 function xml_parser_create(?string $encoding = null): XMLParser {}
 
 function xml_parser_create_ns(?string $encoding = null, string $separator = ":"): XMLParser {}
diff --git a/ext/xml/xml_arginfo.h b/ext/xml/xml_arginfo.h
index ef67e7f253856..53f7e6026cde4 100644
--- a/ext/xml/xml_arginfo.h
+++ b/ext/xml/xml_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 97ce33bf2fbe970f7ca1c1845fbf5063dbd118dd */
+ * Stub hash: fa0ee6afa65408c431e89e542dc8292737c4ff80 */
 
 ZEND_BEGIN_ARG_WITH_RETURN_OBJ_INFO_EX(arginfo_xml_parser_create, 0, 0, XMLParser, 0)
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, encoding, IS_STRING, 1, "null")
@@ -166,6 +166,7 @@ static void register_xml_symbols(int module_number)
 	REGISTER_LONG_CONSTANT("XML_OPTION_TARGET_ENCODING", PHP_XML_OPTION_TARGET_ENCODING, CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("XML_OPTION_SKIP_TAGSTART", PHP_XML_OPTION_SKIP_TAGSTART, CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("XML_OPTION_SKIP_WHITE", PHP_XML_OPTION_SKIP_WHITE, CONST_PERSISTENT);
+	REGISTER_STRING_CONSTANT("XML_SAX_IMPL", PHP_XML_SAX_IMPL, CONST_PERSISTENT);
 }
 
 static zend_class_entry *register_class_XMLParser(void)