diff --git a/daemon/fw/process-nack-traits.hpp b/daemon/fw/process-nack-traits.hpp
index c07537b..6a98da4 100644
--- a/daemon/fw/process-nack-traits.hpp
+++ b/daemon/fw/process-nack-traits.hpp
@@ -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,
@@ -28,8 +28,7 @@
 
 #include "strategy.hpp"
 
-namespace nfd {
-namespace fw {
+namespace nfd::fw {
 
 /** \brief Provides a common procedure for processing Nacks
  *
@@ -95,7 +94,6 @@
   S* m_strategy;
 };
 
-} // namespace fw
-} // namespace nfd
+} // namespace nfd::fw
 
 #endif // NFD_DAEMON_FW_PROCESS_NACK_TRAITS_HPP