diff --git a/daemon/face/tcp-transport.hpp b/daemon/face/tcp-transport.hpp
index ffd05a8..d6b0890 100644
--- a/daemon/face/tcp-transport.hpp
+++ b/daemon/face/tcp-transport.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
- * Copyright (c) 2014-2017,  Regents of the University of California,
+/*
+ * Copyright (c) 2014-2018,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -44,6 +44,9 @@
 public:
   TcpTransport(protocol::socket&& socket, ndn::nfd::FacePersistency persistency);
 
+  ssize_t
+  getSendQueueLength() final;
+
 protected:
   bool
   canChangePersistencyToImpl(ndn::nfd::FacePersistency newPersistency) const final;