diff --git a/src/challenge/challenge-possession.cpp b/src/challenge/challenge-possession.cpp
index 20b0127..2473f29 100644
--- a/src/challenge/challenge-possession.cpp
+++ b/src/challenge/challenge-possession.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2023, Regents of the University of California.
+ * Copyright (c) 2017-2024, Regents of the University of California.
  *
  * This file is part of ndncert, a certificate management system based on NDN.
  *
@@ -23,6 +23,7 @@
 #include <ndn-cxx/security/transform/public-key.hpp>
 #include <ndn-cxx/security/verification-helpers.hpp>
 #include <ndn-cxx/util/io.hpp>
+#include <ndn-cxx/util/logger.hpp>
 #include <ndn-cxx/util/random.hpp>
 
 #include <boost/property_tree/json_parser.hpp>