diff --git a/src/repo.hpp b/src/repo.hpp
index 754a63c..ef506a7 100644
--- a/src/repo.hpp
+++ b/src/repo.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2014,  Regents of the University of California.
+ * Copyright (c) 2014-2017, Regents of the University of California.
  *
  * This file is part of NDN repo-ng (Next generation of NDN repository).
  * See AUTHORS.md for complete list of repo-ng authors and contributors.
@@ -32,6 +32,7 @@
 
 #include "common.hpp"
 
+#include <ndn-cxx/security/validator-null.hpp>
 #include <boost/property_tree/ptree.hpp>
 #include <boost/property_tree/info_parser.hpp>
 
@@ -85,7 +86,7 @@
   std::shared_ptr<Storage> m_store;
   RepoStorage m_storageHandle;
   KeyChain m_keyChain;
-  ValidatorConfig m_validator;
+  ndn::ValidatorNull m_validator;
   ReadHandle m_readHandle;
   WriteHandle m_writeHandle;
   WatchHandle m_watchHandle;