diff --git a/src/detail/error-encoder.hpp b/src/detail/error-encoder.hpp
index 67fe80f..3b17353 100644
--- a/src/detail/error-encoder.hpp
+++ b/src/detail/error-encoder.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
- * Copyright (c) 2017-2020, Regents of the University of California.
+/*
+ * Copyright (c) 2017-2021, Regents of the University of California.
  *
  * This file is part of ndncert, a certificate management system based on NDN.
  *
@@ -23,7 +23,6 @@
 
 #include "detail/ca-profile.hpp"
 
-namespace ndn {
 namespace ndncert {
 namespace errortlv {
 
@@ -41,6 +40,5 @@
 
 } // namespace errortlv
 } // namespace ndncert
-} // namespace ndn
 
-#endif // NDNCERT_DETAIL_ERROR_ENCODER_HPP
\ No newline at end of file
+#endif // NDNCERT_DETAIL_ERROR_ENCODER_HPP