diff --git a/tools/peek/ndnpeek/main.cpp b/tools/peek/ndnpeek/main.cpp
index 0bfb677..7b6fd38 100644
--- a/tools/peek/ndnpeek/main.cpp
+++ b/tools/peek/ndnpeek/main.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2022,  Regents of the University of California,
+ * Copyright (c) 2014-2024,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -40,6 +40,7 @@
 #include <cerrno>
 #include <cstring>
 #include <fstream>
+#include <iostream>
 
 namespace ndn::peek {
 
diff --git a/tools/peek/ndnpeek/ndnpeek.cpp b/tools/peek/ndnpeek/ndnpeek.cpp
index 3673224..919ce1e 100644
--- a/tools/peek/ndnpeek/ndnpeek.cpp
+++ b/tools/peek/ndnpeek/ndnpeek.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2023,  Regents of the University of California,
+ * Copyright (c) 2014-2024,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -29,6 +29,8 @@
 
 #include "ndnpeek.hpp"
 
+#include <iostream>
+
 namespace ndn::peek {
 
 NdnPeek::NdnPeek(Face& face, const PeekOptions& options)
diff --git a/tools/peek/ndnpeek/ndnpeek.hpp b/tools/peek/ndnpeek/ndnpeek.hpp
index f7f246b..8d11bc8 100644
--- a/tools/peek/ndnpeek/ndnpeek.hpp
+++ b/tools/peek/ndnpeek/ndnpeek.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2022,  Regents of the University of California,
+ * Copyright (c) 2014-2024,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -32,9 +32,13 @@
 
 #include "core/common.hpp"
 
+#include <ndn-cxx/face.hpp>
 #include <ndn-cxx/link.hpp>
 #include <ndn-cxx/util/scheduler.hpp>
 
+#include <optional>
+#include <vector>
+
 namespace ndn::peek {
 
 /**
@@ -49,7 +53,7 @@
   std::vector<Name> forwardingHint;
   time::milliseconds interestLifetime = DEFAULT_INTEREST_LIFETIME;
   std::optional<uint8_t> hopLimit;
-  shared_ptr<Buffer> applicationParameters;
+  std::shared_ptr<Buffer> applicationParameters;
 
   // program behavior options
   bool isVerbose = false;