diff --git a/ndn-cpp/NDN.hpp b/ndn-cpp/NDN.hpp
index a89918b..9c8c691 100644
--- a/ndn-cpp/NDN.hpp
+++ b/ndn-cpp/NDN.hpp
@@ -6,13 +6,22 @@
 #ifndef NDN_NDN_HPP
 #define	NDN_NDN_HPP
 
+#include "Closure.hpp"
 #include "encoding/BinaryXMLElementReader.hpp"
 
 namespace ndn {
 
 class NDN : public ElementListener {
 public:
+  NDN(Closure *closure)
+  {
+    closure_ = closure;
+  }
+  
   virtual void onReceivedElement(unsigned char *element, unsigned int elementLength);
+  
+private:
+  Closure *closure_;
 };
 
 }