diff --git a/src/security/transform/base64-encode.hpp b/src/security/transform/base64-encode.hpp
index d62b5d8..34ad577 100644
--- a/src/security/transform/base64-encode.hpp
+++ b/src/security/transform/base64-encode.hpp
@@ -1,5 +1,5 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
+/*
  * Copyright (c) 2013-2017 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
@@ -42,6 +42,8 @@
   explicit
   Base64Encode(bool needBreak = true);
 
+  ~Base64Encode();
+
 private:
   /**
    * @brief Read partial transformation result (if exists) from BIO