diff --git a/daemon/face/websocket-face.cpp b/daemon/face/websocket-face.cpp
index c0d6732..79faf73 100644
--- a/daemon/face/websocket-face.cpp
+++ b/daemon/face/websocket-face.cpp
@@ -48,6 +48,7 @@
 
   this->onSendInterest(interest);
   const Block& payload = interest.wireEncode();
+  this->getMutableCounters().getNOutBytes() += payload.size();
 
   try {
     m_server.send(m_handle, payload.wire(), payload.size(),
@@ -67,6 +68,7 @@
 
   this->onSendData(data);
   const Block& payload = data.wireEncode();
+  this->getMutableCounters().getNOutBytes() += payload.size();
 
   try {
     m_server.send(m_handle, payload.wire(), payload.size(),
@@ -97,6 +99,8 @@
   // Copy message into Face internal buffer
   BOOST_ASSERT(msg.size() <= MAX_NDN_PACKET_SIZE);
 
+  this->getMutableCounters().getNInBytes() += msg.size();
+
   // Try to parse message data
   bool isOk = true;
   Block element;
diff --git a/tests/core/segment-publisher.cpp b/tests/core/segment-publisher.cpp
index da35376..f859408 100644
--- a/tests/core/segment-publisher.cpp
+++ b/tests/core/segment-publisher.cpp
@@ -37,7 +37,7 @@
 
 NFD_LOG_INIT("SegmentPublisherTest");
 
-template<size_t N=10000>
+template<int64_t N=10000>
 class TestSegmentPublisher : public SegmentPublisher<DummyFace>
 {
 public:
@@ -73,7 +73,7 @@
   generate(ndn::EncodingBuffer& outBuffer)
   {
     size_t totalLength = 0;
-    for (uint64_t i = 0; i < N; i++)
+    for (int64_t i = 0; i < N; i++)
       {
         totalLength += prependNonNegativeIntegerBlock(outBuffer, ndn::Tlv::Content, i);
       }
@@ -85,7 +85,7 @@
   size_t m_totalPayloadLength;
 };
 
-template<size_t N>
+template<int64_t N>
 class SegmentPublisherFixture : public BaseFixture
 {
 public:
diff --git a/tests/daemon/face/websocket.cpp b/tests/daemon/face/websocket.cpp
index 6eb8dc8..54b4813 100644
--- a/tests/daemon/face/websocket.cpp
+++ b/tests/daemon/face/websocket.cpp
@@ -192,8 +192,6 @@
   websocketpp::connection_hdl handle;
   std::vector<Interest> client1_receivedInterests;
   std::vector<Data> client1_receivedDatas;
-
-  std::list< shared_ptr<Face> > faces;
 };
 
 BOOST_FIXTURE_TEST_CASE(EndToEnd4, EndToEndFixture)
@@ -244,6 +242,8 @@
   client1_sendData    (*data2);
   client1_sendData    (*data2);
   client1_sendData    (*data2);
+  size_t nBytesSent = data1->wireEncode().size() + interest2->wireEncode().size();
+  size_t nBytesReceived = interest1->wireEncode().size() * 3 + data2->wireEncode().size() * 3;
 
   BOOST_CHECK_MESSAGE(limitedIo.run(8, time::seconds(10)) == LimitedIo::EXCEED_OPS,
                       "WebSocketChannel error: cannot send or receive Interest/Data packets");
@@ -263,6 +263,8 @@
   BOOST_CHECK_EQUAL(counters1.getNInDatas()     , 3);
   BOOST_CHECK_EQUAL(counters1.getNOutInterests(), 1);
   BOOST_CHECK_EQUAL(counters1.getNOutDatas()    , 1);
+  BOOST_CHECK_EQUAL(counters1.getNInBytes(), nBytesReceived);
+  BOOST_CHECK_EQUAL(counters1.getNOutBytes(), nBytesSent);
 }
 
 BOOST_AUTO_TEST_SUITE_END()