diff --git a/daemon/face/face-counters.cpp b/daemon/face/face-counters.cpp
index 275783f..ec8572e 100644
--- a/daemon/face/face-counters.cpp
+++ b/daemon/face/face-counters.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,
@@ -25,8 +25,7 @@
 
 #include "face-counters.hpp"
 
-namespace nfd {
-namespace face {
+namespace nfd::face {
 
 FaceCounters::FaceCounters(const LinkService::Counters& linkServiceCounters,
                            const Transport::Counters& transportCounters)
@@ -46,5 +45,4 @@
 {
 }
 
-} // namespace face
-} // namespace nfd
+} // namespace nfd::face