diff --git a/ndn.cxx/detail/pending-interests-container.h b/ndn.cxx/detail/pending-interests-container.h
index 78ab10d..673d33b 100644
--- a/ndn.cxx/detail/pending-interests-container.h
+++ b/ndn.cxx/detail/pending-interests-container.h
@@ -23,7 +23,12 @@
 public:
   PendingInterestEntry (Ptr<const Interest> interest)
     : m_interest (interest)
-  { }
+  {
+  }
+
+  virtual ~PendingInterestEntry ()
+  {
+  }
 
   void
   AddCallbacks (ApiFace::DataCallback onData, ApiFace::TimeoutCallback onTimeout)