diff --git a/ext/dom/php_dom.h b/ext/dom/php_dom.h
index efc28ce79c8..e60b5631202 100644
--- a/ext/dom/php_dom.h
+++ b/ext/dom/php_dom.h
@@ -167,7 +167,6 @@ bool php_dom_has_sibling_following_node(xmlNodePtr node, xmlElementType type);
 bool php_dom_has_sibling_preceding_node(xmlNodePtr node, xmlElementType type);
 bool php_dom_has_child_of_type(xmlNodePtr node, xmlElementType type);
 void php_dom_update_document_after_clone(dom_object *original, xmlNodePtr original_node, dom_object *clone, xmlNodePtr cloned_node);
-void php_dom_document_constructor(INTERNAL_FUNCTION_PARAMETERS);
 xmlAttrPtr php_dom_get_attribute_node(xmlNodePtr elem, const xmlChar *name, size_t name_len);
 xmlChar *php_dom_libxml_fix_file_path(xmlChar *path);
 void dom_document_convert_to_modern(php_libxml_ref_obj *document, xmlDocPtr lxml_doc);