diff --git a/tools/nfdc/cs-module.cpp b/tools/nfdc/cs-module.cpp
index cdaad5a..73d066c 100644
--- a/tools/nfdc/cs-module.cpp
+++ b/tools/nfdc/cs-module.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2020,  Regents of the University of California,
+ * Copyright (c) 2014-2022,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -28,9 +28,7 @@
 
 #include <ndn-cxx/util/indented-stream.hpp>
 
-namespace nfd {
-namespace tools {
-namespace nfdc {
+namespace nfd::tools::nfdc {
 
 void
 CsModule::registerCommands(CommandParser& parser)
@@ -184,6 +182,4 @@
      << ia.end();
 }
 
-} // namespace nfdc
-} // namespace tools
-} // namespace nfd
+} // namespace nfd::tools::nfdc