diff --git a/src/controller-backend.cpp b/src/controller-backend.cpp
index 496cd9a..1bd9a95 100644
--- a/src/controller-backend.cpp
+++ b/src/controller-backend.cpp
@@ -386,7 +386,7 @@
 
   ndn::util::SegmentFetcher::fetch(m_face,
                                    interest,
-                                   ndn::util::DontVerifySegment(),
+                                   m_nullValidator,
                                    bind(&ControllerBackend::onLocalPrefix, this, _1),
                                    bind(&ControllerBackend::onLocalPrefixError, this, _1, _2));
 }
diff --git a/src/controller-backend.hpp b/src/controller-backend.hpp
index 78865ef..be2cf25 100644
--- a/src/controller-backend.hpp
+++ b/src/controller-backend.hpp
@@ -23,6 +23,7 @@
 #include "validator-invitation.hpp"
 #include <ndn-cxx/security/key-chain.hpp>
 #include <ndn-cxx/util/in-memory-storage-persistent.hpp>
+#include <ndn-cxx/security/validator-null.hpp>
 #include <boost/thread.hpp>
 #include <mutex>
 #endif
@@ -166,6 +167,7 @@
   // Security related;
   ndn::KeyChain m_keyChain;
   ValidatorInvitation m_validator;
+  ndn::ValidatorNull m_nullValidator;
 
   // RegisteredPrefixId
   const ndn::RegisteredPrefixId* m_invitationListenerId;