diff --git a/src/net/common/serverlobbythread.cpp b/src/net/common/serverlobbythread.cpp
index c35deb2b..66f68cae 100644
--- a/src/net/common/serverlobbythread.cpp
+++ b/src/net/common/serverlobbythread.cpp
@@ -47,6 +47,7 @@
 #include <boost/lambda/lambda.hpp>
 #include <boost/filesystem.hpp>
 #include <boost/bind.hpp>
+#include <boost/uuid/uuid.hpp>
 #include <gsasl.h>
 
 #define SERVER_MAX_NUM_SESSIONS						512		// Maximum number of idle users in lobby.
@@ -1665,6 +1666,11 @@ ServerLobbyThread::EstablishSession(SessionWrapper session)
 	boost::shared_ptr<NetPacket> ack(new NetPacket(NetPacket::Alloc));
 	ack->GetMsg()->present = PokerTHMessage_PR_initAckMessage;
 	InitAckMessage_t *netInitAck = &ack->GetMsg()->choice.initAckMessage;
+	boost::uuids::uuid sessionId(m_sessionIdGenerator());
+	OCTET_STRING_fromBuf(
+		&netInitAck->yourSessionId,
+		(char *)&sessionId,
+		boost::uuids::uuid::static_size());
 //	initAckData.sessionId = session.sessionData->GetId(); // TODO: currently unused.
 	netInitAck->yourPlayerId = session.playerData->GetUniqueId();
 	GetSender().Send(session.sessionData, ack);
diff --git a/src/net/serverlobbythread.h b/src/net/serverlobbythread.h
index cc2813d3..e98a601b 100644
--- a/src/net/serverlobbythread.h
+++ b/src/net/serverlobbythread.h
@@ -23,6 +23,7 @@
 
 #include <boost/asio.hpp>
 #include <boost/enable_shared_from_this.hpp>
+#include <boost/uuid/uuid_generators.hpp>
 
 #include <net/sessionmanager.h>
 #include <net/netpacket.h>
@@ -258,6 +259,8 @@ private:
 	boost::asio::deadline_timer m_saveStatisticsTimer;
 	boost::asio::deadline_timer m_loginLockTimer;
 
+	boost::uuids::random_generator m_sessionIdGenerator;
+
 	const boost::posix_time::ptime m_startTime;
 
 friend class InternalServerCallback;