diff --git a/tools/ping/client/ping.hpp b/tools/ping/client/ping.hpp
index b2e4bfd..3509ac9 100644
--- a/tools/ping/client/ping.hpp
+++ b/tools/ping/client/ping.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2015-2023,  Arizona Board of Regents.
+ * Copyright (c) 2015-2024,  Arizona Board of Regents.
  *
  * This file is part of ndn-tools (Named Data Networking Essential Tools).
  * See AUTHORS.md for complete list of ndn-tools authors and contributors.
@@ -26,6 +26,8 @@
 
 #include "core/common.hpp"
 
+#include <ndn-cxx/face.hpp>
+#include <ndn-cxx/util/scheduler.hpp>
 #include <ndn-cxx/util/signal.hpp>
 
 namespace ndn::ping::client {