diff --git a/tools/ping/server/ping-server.cpp b/tools/ping/server/ping-server.cpp
index ad8177c..5ceeb76 100644
--- a/tools/ping/server/ping-server.cpp
+++ b/tools/ping/server/ping-server.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2015-2019,  Arizona Board of Regents.
+ * Copyright (c) 2015-2021,  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.
@@ -42,12 +42,11 @@
 void
 PingServer::start()
 {
-  m_registeredPrefix = m_face.setInterestFilter(
-                       Name(m_options.prefix).append("ping"),
-                       bind(&PingServer::onInterest, this, _2),
-                       [] (const auto&, const auto& reason) {
-                         NDN_THROW(std::runtime_error("Failed to register prefix: " + reason));
-                       });
+  m_registeredPrefix = m_face.setInterestFilter(Name(m_options.prefix).append("ping"),
+                         [this] (const auto&, const auto& interest) { onInterest(interest); },
+                         [] (const auto&, const auto& reason) {
+                           NDN_THROW(std::runtime_error("Failed to register prefix: " + reason));
+                         });
 }
 
 void
diff --git a/tools/ping/server/tracer.cpp b/tools/ping/server/tracer.cpp
index 51b191c..c6b30b9 100644
--- a/tools/ping/server/tracer.cpp
+++ b/tools/ping/server/tracer.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2015-2018,  Arizona Board of Regents.
+ * Copyright (c) 2015-2021,  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.
@@ -29,20 +29,15 @@
   : m_options(options)
 {
   if (!m_options.wantQuiet) {
-    pingServer.afterReceive.connect([this] (const Name& name) { onReceive(name); });
+    pingServer.afterReceive.connect([this] (const Name& name) {
+      if (m_options.wantTimestamp) {
+        std::cout << time::toIsoString(time::system_clock::now()) << " - ";
+      }
+      std::cout << "interest received: seq=" << name.at(-1) << "\n";
+    });
   }
 }
 
-void
-Tracer::onReceive(const Name& name)
-{
-  if (m_options.wantTimestamp) {
-    std::cout << time::toIsoString(time::system_clock::now()) << " - ";
-  }
-
-  std::cout << "interest received: seq=" << name.at(-1) << std::endl;
-}
-
 } // namespace server
 } // namespace ping
 } // namespace ndn
diff --git a/tools/ping/server/tracer.hpp b/tools/ping/server/tracer.hpp
index b8b6952..a84b72e 100644
--- a/tools/ping/server/tracer.hpp
+++ b/tools/ping/server/tracer.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
- * Copyright (c) 2015,  Arizona Board of Regents.
+/*
+ * Copyright (c) 2015-2021,  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.
@@ -31,20 +31,13 @@
 namespace server {
 
 /**
- * @brief logs ping responses
+ * @brief Logs ping responses
  */
 class Tracer : noncopyable
 {
 public:
   Tracer(PingServer& pingServer, const Options& options);
 
-  /**
-   * @brief Prints ping information when interest received
-   * @param name interest name received
-   */
-  void
-  onReceive(const Name& name);
-
 private:
   const Options& m_options;
 };