diff --git a/daemon/face/datagram-face.hpp b/daemon/face/datagram-face.hpp
index d065487..5b1b3d9 100644
--- a/daemon/face/datagram-face.hpp
+++ b/daemon/face/datagram-face.hpp
@@ -98,7 +98,7 @@
 
 protected:
   shared_ptr<typename protocol::socket> m_socket;
-  uint8_t m_inputBuffer[MAX_NDN_PACKET_SIZE];
+  uint8_t m_inputBuffer[ndn::MAX_NDN_PACKET_SIZE];
   bool m_hasBeenUsedRecently;
 
   NFD_LOG_INCLASS_DECLARE();
@@ -115,7 +115,7 @@
 {
   setOnDemand(isOnDemand);
 
-  m_socket->async_receive(boost::asio::buffer(m_inputBuffer, MAX_NDN_PACKET_SIZE), 0,
+  m_socket->async_receive(boost::asio::buffer(m_inputBuffer, ndn::MAX_NDN_PACKET_SIZE), 0,
                           bind(&DatagramFace<T, U>::handleReceive, this, _1, _2));
 }
 
@@ -211,7 +211,7 @@
   NFD_LOG_DEBUG("handleReceive: " << nBytesReceived);
   receiveDatagram(m_inputBuffer, nBytesReceived, error);
   if (m_socket->is_open())
-    m_socket->async_receive(boost::asio::buffer(m_inputBuffer, MAX_NDN_PACKET_SIZE), 0,
+    m_socket->async_receive(boost::asio::buffer(m_inputBuffer, ndn::MAX_NDN_PACKET_SIZE), 0,
                             bind(&DatagramFace<T, U>::handleReceive, this, _1, _2));
 }