Fix compilation with Boost 1.65.0
Change-Id: Ib88b7e13bddb1728dd882c086e97edffdd696f0d
Refs: #4258
diff --git a/tests/core/logger.t.cpp b/tests/core/logger.t.cpp
index 11dcfa4..b2fb4c7 100644
--- a/tests/core/logger.t.cpp
+++ b/tests/core/logger.t.cpp
@@ -1,6 +1,6 @@
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
- * Copyright (c) 2014-2016, Regents of the University of California,
+/*
+ * Copyright (c) 2014-2017, Regents of the University of California,
* Arizona Board of Regents,
* Colorado State University,
* University Pierre & Marie Curie, Sorbonne University,
@@ -30,6 +30,8 @@
#include <boost/algorithm/string/classification.hpp>
#include <boost/algorithm/string/split.hpp>
+#include <iostream>
+
namespace nfd {
namespace tests {