diff --git a/tests/unit/face.t.cpp b/tests/unit/face.t.cpp
index f7c6132..eaab9b6 100644
--- a/tests/unit/face.t.cpp
+++ b/tests/unit/face.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2013-2020 Regents of the University of California.
+ * Copyright (c) 2013-2021 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
@@ -35,6 +35,7 @@
 namespace tests {
 
 using ndn::util::DummyClientFace;
+using std::bind;
 
 struct WantPrefixRegReply;
 struct NoPrefixRegReply;