diff --git a/daemon/face/channel.cpp b/daemon/face/channel.cpp
index dd3b118..fa25405 100644
--- a/daemon/face/channel.cpp
+++ b/daemon/face/channel.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2021,  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,
@@ -26,8 +26,7 @@
 #include "channel.hpp"
 #include "face.hpp"
 
-namespace nfd {
-namespace face {
+namespace nfd::face {
 
 Channel::~Channel() = default;
 
@@ -53,5 +52,4 @@
   });
 }
 
-} // namespace face
-} // namespace nfd
+} // namespace nfd::face