diff --git a/tests/integrated/network-monitor.cpp b/tests/integrated/network-monitor.cpp
index 9ed4bb3..cbc0e8a 100644
--- a/tests/integrated/network-monitor.cpp
+++ b/tests/integrated/network-monitor.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).
  *
@@ -25,11 +25,13 @@
 
 #include "util/network-monitor.hpp"
 
-#include "boost-test.hpp"
-#include <cstdlib>
-#include <iostream>
 #include "util/time.hpp"
 
+#include "boost-test.hpp"
+
+#include <boost/asio/io_service.hpp>
+#include <iostream>
+
 namespace ndn {
 namespace util {
 
diff --git a/tests/unit-tests/unit-test-time-fixture.hpp b/tests/unit-tests/unit-test-time-fixture.hpp
index 9c349fb..8d7ac17 100644
--- a/tests/unit-tests/unit-test-time-fixture.hpp
+++ b/tests/unit-tests/unit-test-time-fixture.hpp
@@ -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).
  *
@@ -23,7 +23,8 @@
 #define NDN_TESTS_UNIT_TESTS_UNIT_TEST_TIME_FIXTURE_HPP
 
 #include "util/time-unit-test-clock.hpp"
-#include <boost/asio.hpp>
+
+#include <boost/asio/io_service.hpp>
 
 namespace ndn {
 namespace tests {
diff --git a/tests/unit-tests/util/dns.t.cpp b/tests/unit-tests/util/dns.t.cpp
index 630295b..be94ba9 100644
--- a/tests/unit-tests/util/dns.t.cpp
+++ b/tests/unit-tests/util/dns.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).
  *
@@ -23,6 +23,8 @@
 
 #include "boost-test.hpp"
 #include "../network-configuration-detector.hpp"
+
+#include <boost/asio.hpp>
 #include <boost/lexical_cast.hpp>
 
 namespace ndn {