diff --git a/ext/dom/domexception.c b/ext/dom/domexception.c
index 09532562d1712..b9771fb03852d 100644
--- a/ext/dom/domexception.c
+++ b/ext/dom/domexception.c
@@ -30,7 +30,7 @@
 * Since:
 */
 
-void php_dom_throw_error_with_message(int error_code, char *error_message, bool strict_error) /* {{{ */
+void php_dom_throw_error_with_message(dom_exception_code error_code, const char *error_message, bool strict_error) /* {{{ */
 {
 	if (strict_error) {
 		zend_throw_exception(dom_domexception_class_entry, error_message, error_code);
@@ -41,9 +41,9 @@ void php_dom_throw_error_with_message(int error_code, char *error_message, bool
 /* }}} */
 
 /* {{{ php_dom_throw_error */
-void php_dom_throw_error(int error_code, bool strict_error)
+void php_dom_throw_error(dom_exception_code error_code, bool strict_error)
 {
-	char *error_message;
+	const char *error_message;
 
 	switch (error_code)
 	{
diff --git a/ext/dom/php_dom.h b/ext/dom/php_dom.h
index 891c771d7931c..27c603a3d9d40 100644
--- a/ext/dom/php_dom.h
+++ b/ext/dom/php_dom.h
@@ -130,8 +130,8 @@ zend_object *dom_nnodemap_objects_new(zend_class_entry *class_type);
 zend_object *dom_xpath_objects_new(zend_class_entry *class_type);
 #endif
 bool dom_get_strict_error(php_libxml_ref_obj *document);
-void php_dom_throw_error(int error_code, bool strict_error);
-void php_dom_throw_error_with_message(int error_code, char *error_message, bool strict_error);
+void php_dom_throw_error(dom_exception_code error_code, bool strict_error);
+void php_dom_throw_error_with_message(dom_exception_code error_code, const char *error_message, bool strict_error);
 void node_list_unlink(xmlNodePtr node);
 int dom_check_qname(char *qname, char **localname, char **prefix, int uri_len, int name_len);
 xmlNsPtr dom_get_ns(xmlNodePtr node, char *uri, int *errorcode, char *prefix);