diff --git a/ext/dom/parentnode.c b/ext/dom/parentnode.c
index ce0373d4c8f77..afc87c6495e44 100644
--- a/ext/dom/parentnode.c
+++ b/ext/dom/parentnode.c
@@ -433,7 +433,7 @@ xmlNode* dom_zvals_to_single_node(php_libxml_ref_obj *document, xmlNode *context
 	return NULL;
 }
 
-static zend_result dom_sanity_check_node_list_types(zval *nodes, int nodesc, zend_class_entry *node_ce)
+static zend_result dom_sanity_check_node_list_types(zval *nodes, uint32_t nodesc, zend_class_entry *node_ce)
 {
 	for (uint32_t i = 0; i < nodesc; i++) {
 		zend_uchar type = Z_TYPE(nodes[i]);