diff --git a/src/cpp/handler/handlerengine.cpp b/src/cpp/handler/handlerengine.cpp
index 1571fa3e..37ec4374 100644
--- a/src/cpp/handler/handlerengine.cpp
+++ b/src/cpp/handler/handlerengine.cpp
@@ -1256,6 +1256,9 @@ class HandlerEngine::Private : public QObject
 	Connection connectionsRefreshedConnection;
 	Connection unsubscribedConnection;
 	Connection reportedConnection;
+	Connection sendConnection;
+	Connection expConnection;
+	Connection errorConnection;
 	Connection pullConnection;
 	Connection controlValveConnection;
 	Connection inSubValveConnection;
@@ -2600,9 +2603,9 @@ class HandlerEngine::Private : public QObject
 				if(!s)
 				{
 					s = new WsSession(this);
-					connect(s, &WsSession::send, this, &Private::wssession_send);
-					connect(s, &WsSession::expired, this, &Private::wssession_expired);
-					connect(s, &WsSession::error, this, &Private::wssession_error);
+					sendConnection = s->send.connect(boost::bind(&Private::wssession_send, this, boost::placeholders::_1, boost::placeholders::_2, boost::placeholders::_3, s));
+					expConnection = s->expired.connect(boost::bind(&Private::wssession_expired, this, s));
+					errorConnection = s->error.connect(boost::bind(&Private::wssession_error, this, s));
 					s->cid = QString::fromUtf8(item.cid);
 					s->ttl = item.ttl;
 					s->requestData.uri = item.uri;
@@ -3132,10 +3135,8 @@ private slots:
 			writeRetryPacket(rp);
 	}
 
-	void wssession_send(int reqId, const QByteArray &type, const QByteArray &message)
+	void wssession_send(int reqId, const QByteArray &type, const QByteArray &message, WsSession *s)
 	{
-		WsSession *s = (WsSession *)sender();
-
 		WsControlPacket::Item i;
 		i.cid = s->cid.toUtf8();
 		i.requestId = QByteArray::number(reqId);
@@ -3147,17 +3148,13 @@ private slots:
 		writeWsControlItems(QList<WsControlPacket::Item>() << i);
 	}
 
-	void wssession_expired()
+	void wssession_expired(WsSession *s)
 	{
-		WsSession *s = (WsSession *)sender();
-
 		removeWsSession(s);
 	}
 
-	void wssession_error()
+	void wssession_error(WsSession *s)
 	{
-		WsSession *s = (WsSession *)sender();
-
 		log_debug("ws session %s control error", qPrintable(s->cid));
 
 		WsControlPacket::Item i;
diff --git a/src/cpp/handler/wssession.cpp b/src/cpp/handler/wssession.cpp
index 58653bb2..0fad0eb0 100644
--- a/src/cpp/handler/wssession.cpp
+++ b/src/cpp/handler/wssession.cpp
@@ -122,7 +122,7 @@ void WsSession::expireTimer_timeout()
 {
 	log_debug("timing out ws session: %s", qPrintable(cid));
 
-	emit expired();
+	expired();
 }
 
 void WsSession::delayedTimer_timeout()
@@ -135,7 +135,7 @@ void WsSession::delayedTimer_timeout()
 	pendingRequests[reqId] = QDateTime::currentMSecsSinceEpoch() + WSCONTROL_REQUEST_TIMEOUT;
 	setupRequestTimer();
 
-	emit send(reqId, delayedType, message);
+	send(reqId, delayedType, message);
 }
 
 void WsSession::requestTimer_timeout()
@@ -144,5 +144,5 @@ void WsSession::requestTimer_timeout()
 	pendingRequests.clear();
 	setupRequestTimer();
 
-	emit error();
+	error();
 }
diff --git a/src/cpp/handler/wssession.h b/src/cpp/handler/wssession.h
index 79d898f9..8d1c737c 100644
--- a/src/cpp/handler/wssession.h
+++ b/src/cpp/handler/wssession.h
@@ -27,6 +27,10 @@
 #include <QHash>
 #include <QSet>
 #include "packet/httprequestdata.h"
+#include <boost/signals2.hpp>
+
+using Signal = boost::signals2::signal<void()>;
+using Connection = boost::signals2::scoped_connection;
 
 class QTimer;
 
@@ -64,10 +68,9 @@ class WsSession : public QObject
 	void sendDelayed(const QByteArray &type, const QByteArray &message, int timeout);
 	void ack(int reqId);
 
-signals:
-	void send(int reqId, const QByteArray &type, const QByteArray &message);
-	void expired();
-	void error();
+    boost::signals2::signal<void(int, const QByteArray&, const QByteArray&)> send;
+    Signal expired;
+    Signal error;
 
 private:
 	void setupRequestTimer();