diff --git a/daemon/table/pit-iterator.cpp b/daemon/table/pit-iterator.cpp
index 58777a7..f0d0c8a 100644
--- a/daemon/table/pit-iterator.cpp
+++ b/daemon/table/pit-iterator.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2018,  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,
@@ -27,8 +27,7 @@
 
 #include <ndn-cxx/util/concepts.hpp>
 
-namespace nfd {
-namespace pit {
+namespace nfd::pit {
 
 NDN_CXX_ASSERT_FORWARD_ITERATOR(Iterator);
 
@@ -61,5 +60,4 @@
   return copy;
 }
 
-} // namespace pit
-} // namespace nfd
+} // namespace nfd::pit