diff --git a/model/pit/ndn-pit-entry-impl.h b/model/pit/ndn-pit-entry-impl.h
index 6af9cc5..025ef54 100644
--- a/model/pit/ndn-pit-entry-impl.h
+++ b/model/pit/ndn-pit-entry-impl.h
@@ -31,6 +31,9 @@
 template<class Pit>
 class EntryImpl : public Entry
 {
+public:
+  typedef Entry base_type;
+
   typedef Entry super;
   #define CONTAINER static_cast<Pit&> (m_container)