diff --git a/include/yaml-cpp/nodebuilder.h b/include/yaml-cpp/nodebuilder.h
index a6a47f0..f0481de 100644
--- a/include/yaml-cpp/nodebuilder.h
+++ b/include/yaml-cpp/nodebuilder.h
@@ -47,13 +47,13 @@ class NodeBuilder : public EventHandler {
                           anchor_t anchor, EmitterStyle::value style);
   virtual void OnMapEnd();
 
- private:
+ protected:
   detail::node& Push(const Mark& mark, anchor_t anchor);
   void Push(detail::node& node);
   void Pop();
   void RegisterAnchor(anchor_t anchor, detail::node& node);
 
- private:
+ protected:
   detail::shared_memory_holder m_pMemory;
   detail::node* m_pRoot;