diff --git a/tools/repo-ng-ls.cpp b/tools/repo-ng-ls.cpp
index 3a916a3..1dc4410 100644
--- a/tools/repo-ng-ls.cpp
+++ b/tools/repo-ng-ls.cpp
@@ -1,5 +1,5 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
+/*
  * Copyright (c) 2014-2017, Regents of the University of California.
  *
  * This file is part of NDN repo-ng (Next generation of NDN repository).
@@ -19,10 +19,14 @@
 
 #include "../src/common.hpp"
 #include "config.hpp"
+
+#include <iostream>
 #include <string>
-#include <sqlite3.h>
-#include <boost/property_tree/ptree.hpp>
+
 #include <boost/property_tree/info_parser.hpp>
+#include <boost/property_tree/ptree.hpp>
+
+#include <sqlite3.h>
 
 namespace repo {