Cleanup iostream includes
Change-Id: I16dd945998463975b140c7a010d64a112f95d8ba
diff --git a/src/util/time.cpp b/src/util/time.cpp
index 8452075..6f669cb 100644
--- a/src/util/time.cpp
+++ b/src/util/time.cpp
@@ -1,5 +1,5 @@
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
+/*
* Copyright (c) 2013-2017 Regents of the University of California.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
@@ -23,6 +23,7 @@
#include "time-custom-clock.hpp"
#include <boost/date_time/posix_time/posix_time.hpp>
+#include <sstream>
namespace ndn {
namespace time {