diff --git a/tests/unit-tests/security/conf/checker.t.cpp b/tests/unit-tests/security/conf/checker.t.cpp
index e989237..64588eb 100644
--- a/tests/unit-tests/security/conf/checker.t.cpp
+++ b/tests/unit-tests/security/conf/checker.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2013-2015 Regents of the University of California.
+ * Copyright (c) 2013-2016 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
@@ -29,6 +29,8 @@
 namespace conf {
 namespace tests {
 
+using namespace ndn::tests;
+
 BOOST_FIXTURE_TEST_SUITE(SecurityConfChecker, IdentityManagementFixture)
 
 void