diff --git a/src/controller-backend.hpp b/src/controller-backend.hpp
index 18b1cd8..2e3aa9f 100644
--- a/src/controller-backend.hpp
+++ b/src/controller-backend.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
 /*
- * Copyright (c) 2013, Regents of the University of California
+ * Copyright (c) 2020, Regents of the University of California
  *
  * BSD license, See the LICENSE file for more information
  *
@@ -57,12 +57,6 @@
   getInvitationRoutingPrefix();
 
   void
-  onInvitationPrefixReset();
-
-  void
-  onInvitationPrefixResetFailed(const std::string& failInfo);
-
-  void
   onInvitationInterest(const ndn::Name& prefix, const ndn::Interest& interest,
                        size_t routingPrefixOffset);
 
@@ -170,8 +164,8 @@
   ndn::security::ValidatorNull m_nullValidator;
 
   // RegisteredPrefixId
-  shared_ptr<ndn::RegisteredPrefixHandle> m_invitationListenerId;
-  shared_ptr<ndn::RegisteredPrefixHandle> m_requestListenerId;
+  ndn::ScopedRegisteredPrefixHandle m_invitationListenerHandle;
+  ndn::ScopedRegisteredPrefixHandle m_requestListenerHandle;
 
   // ChatRoomList
   QStringList m_chatDialogList;