diff --git a/lib/openapi3_parser/node_factory/object_factory/dsl.rb b/lib/openapi3_parser/node_factory/object_factory/dsl.rb
index 1405a9b..f218857 100644
--- a/lib/openapi3_parser/node_factory/object_factory/dsl.rb
+++ b/lib/openapi3_parser/node_factory/object_factory/dsl.rb
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require "openapi3_parser/node_factory"
 require "openapi3_parser/node_factory/object_factory/field_config"
 
 module Openapi3Parser