diff --git a/daemon/face/websocket-transport.hpp b/daemon/face/websocket-transport.hpp
index 0dcb530..3f08d79 100644
--- a/daemon/face/websocket-transport.hpp
+++ b/daemon/face/websocket-transport.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2022,  Regents of the University of California,
+ * Copyright (c) 2014-2024,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -29,6 +29,8 @@
 #include "transport.hpp"
 #include "websocketpp.hpp"
 
+#include <ndn-cxx/util/scheduler.hpp>
+
 namespace nfd::face {
 
 /** \brief Counters provided by WebSocketTransport.
@@ -96,7 +98,7 @@
   websocketpp::connection_hdl m_handle;
   websocket::Server& m_server;
   time::milliseconds m_pingInterval;
-  scheduler::ScopedEventId m_pingEventId;
+  ndn::scheduler::ScopedEventId m_pingEventId;
 };
 
 inline const WebSocketTransport::Counters&