diff --git a/src/util/dummy-client-face.cpp b/src/util/dummy-client-face.cpp
index 79586c6..24b05a3 100644
--- a/src/util/dummy-client-face.cpp
+++ b/src/util/dummy-client-face.cpp
@@ -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).
@@ -265,7 +265,7 @@
 }
 
 void
-DummyClientFace::doProcessEvents(const time::milliseconds& timeout, bool keepThread)
+DummyClientFace::doProcessEvents(time::milliseconds timeout, bool keepThread)
 {
   if (m_processEventsOverride != nullptr) {
     m_processEventsOverride(timeout);
diff --git a/src/util/dummy-client-face.hpp b/src/util/dummy-client-face.hpp
index 630913c..781a797 100644
--- a/src/util/dummy-client-face.hpp
+++ b/src/util/dummy-client-face.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).
@@ -120,7 +120,7 @@
   enableRegistrationReply();
 
   void
-  doProcessEvents(const time::milliseconds& timeout, bool keepThread) override;
+  doProcessEvents(time::milliseconds timeout, bool keepThread) override;
 
 public:
   /** \brief Interests sent out of this DummyClientFace