diff --git a/spectrum/src/frontends/slack/SlackAPI.cpp b/spectrum/src/frontends/slack/SlackAPI.cpp
index 8f970f61cf6a289150050d5846c03c67658faeb1..910a5b5e8190f62b2bca2ebdba78b2143a127a79 100644
--- a/spectrum/src/frontends/slack/SlackAPI.cpp
+++ b/spectrum/src/frontends/slack/SlackAPI.cpp
@@ -147,6 +147,15 @@ void SlackAPI::channelsList( HTTPRequest::Callback callback) {
 	queueRequest(req);
 }
 
+void SlackAPI::channelsInvite(const std::string &channel, const std::string &user, HTTPRequest::Callback callback) {
+	std::string url = "https://slack.com/api/channels.invite?";
+	url += "&channel=" + Util::urlencode(channel);
+	url += "&user=" + Util::urlencode(user);
+	url += "&token=" + Util::urlencode(m_token);
+	HTTPRequest *req = new HTTPRequest(THREAD_POOL(m_component), HTTPRequest::Get, url, callback);
+	queueRequest(req);
+}
+
 void SlackAPI::channelsCreate(const std::string &name, HTTPRequest::Callback callback) {
 	std::string url = "https://slack.com/api/channels.create?name=" + Util::urlencode(name) + "&token=" + Util::urlencode(m_token);
 	HTTPRequest *req = new HTTPRequest(THREAD_POOL(m_component), HTTPRequest::Get, url, callback);
diff --git a/spectrum/src/frontends/slack/SlackAPI.h b/spectrum/src/frontends/slack/SlackAPI.h
index 32e6b9f357b0b17795f9da756c1634bc1d83c6ae..abf2cad37092548dedf49ab87382959b8b746426 100644
--- a/spectrum/src/frontends/slack/SlackAPI.h
+++ b/spectrum/src/frontends/slack/SlackAPI.h
@@ -76,6 +76,7 @@ class SlackAPI : public HTTPRequestQueue {
 		std::string getOwnerId(HTTPRequest *req, bool ok, rapidjson::Document &resp, const std::string &data);
 
 		void channelsCreate(const std::string &name, HTTPRequest::Callback callback);
+		void channelsInvite(const std::string &channel, const std::string &user, HTTPRequest::Callback callback);
 		void channelsList(HTTPRequest::Callback callback);
 
 		void imOpen(const std::string &uid, HTTPRequest::Callback callback);
diff --git a/spectrum/src/frontends/slack/SlackRTM.cpp b/spectrum/src/frontends/slack/SlackRTM.cpp
index 98a19205b6d4525d8926ced88c695e21eefe2632..34825636ce1fd752a0d80eb6d54e19010fda1702 100644
--- a/spectrum/src/frontends/slack/SlackRTM.cpp
+++ b/spectrum/src/frontends/slack/SlackRTM.cpp
@@ -184,6 +184,15 @@ void SlackRTM::handleRTMStart(HTTPRequest *req, bool ok, rapidjson::Document &re
 
 	m_selfName = selfName.GetString();
 
+	rapidjson::Value &selfId = self["id"];
+	if (!selfId.IsString()) {
+		LOG4CXX_ERROR(logger, "No 'id' string in the reply.");
+		LOG4CXX_ERROR(logger, data);
+		return;
+	}
+
+	m_selfId = selfId.GetString();
+
 	SlackAPI::getSlackChannelInfo(req, ok, resp, data, m_channels);
 	SlackAPI::getSlackImInfo(req, ok, resp, data, m_ims);
 	SlackAPI::getSlackUserInfo(req, ok, resp, data, m_users);
diff --git a/spectrum/src/frontends/slack/SlackRTM.h b/spectrum/src/frontends/slack/SlackRTM.h
index e244718a3c3dcbbdf9274652de3306a65e6c5508..3b9a8f967f08e8711ec2d6b824f0ea1f34c62ddd 100644
--- a/spectrum/src/frontends/slack/SlackRTM.h
+++ b/spectrum/src/frontends/slack/SlackRTM.h
@@ -89,6 +89,10 @@ class SlackRTM {
 			return m_selfName;
 		}
 
+		const std::string &getSelfId() {
+			return m_selfId;
+		}
+
 	private:
 		void handlePayloadReceived(const std::string &payload);
 		void handleRTMStart(HTTPRequest *req, bool ok, rapidjson::Document &resp, const std::string &data);
@@ -100,6 +104,7 @@ class SlackRTM {
 		std::map<std::string, SlackImInfo> m_ims;
 		std::map<std::string, SlackUserInfo> m_users;
 		std::string m_selfName;
+		std::string m_selfId;
 
 	private:
 		Component *m_component;
diff --git a/spectrum/src/frontends/slack/SlackSession.cpp b/spectrum/src/frontends/slack/SlackSession.cpp
index e1a151de9e4b4ac6011544fd86acf77aca32ae48..e33e9d5f26d271e32d019c8de6d4d1c7cc71578b 100644
--- a/spectrum/src/frontends/slack/SlackSession.cpp
+++ b/spectrum/src/frontends/slack/SlackSession.cpp
@@ -215,6 +215,15 @@ void SlackSession::handleJoinMessage(const std::string &message, std::vector<std
 	m_api->channelsList(boost::bind(&SlackSession::handleJoinRoomList, this, _1, _2, _3, _4, args));
 }
 
+void SlackSession::handleSlackChannelInvite(HTTPRequest *req, bool ok, rapidjson::Document &resp, const std::string &data) {
+	Swift::Presence::ref presence = Swift::Presence::create();
+	presence->setFrom(Swift::JID("", m_uinfo.jid, "default"));
+	presence->setTo(m_component->getJID());
+	presence->setType(Swift::Presence::Available);
+	presence->addPayload(boost::shared_ptr<Swift::Payload>(new Swift::MUCPayload()));
+	m_component->getFrontend()->onPresenceReceived(presence);
+}
+
 void SlackSession::handleSlackChannelCreate(HTTPRequest *req, bool ok, rapidjson::Document &resp, const std::string &data) {
 	std::string channelId = m_api->getChannelId(req, ok, resp, data);
 	if (channelId.empty()) {
@@ -223,12 +232,7 @@ void SlackSession::handleSlackChannelCreate(HTTPRequest *req, bool ok, rapidjson
 	}
 
 	m_slackChannel = channelId;
-	Swift::Presence::ref presence = Swift::Presence::create();
-	presence->setFrom(Swift::JID("", m_uinfo.jid, "default"));
-	presence->setTo(m_component->getJID());
-	presence->setType(Swift::Presence::Available);
-	presence->addPayload(boost::shared_ptr<Swift::Payload>(new Swift::MUCPayload()));
-	m_component->getFrontend()->onPresenceReceived(presence);
+	m_api->channelsInvite(m_slackChannel, m_rtm->getSelfId(), boost::bind(&SlackSession::handleSlackChannelInvite, this, _1, _2, _3, _4));
 }
 
 void SlackSession::handleSlackChannelList(HTTPRequest *req, bool ok, rapidjson::Document &resp, const std::string &data) {
@@ -237,12 +241,7 @@ void SlackSession::handleSlackChannelList(HTTPRequest *req, bool ok, rapidjson::
 
 	if (channels.find(m_slackChannel) != channels.end()) {
 		m_slackChannel = channels[m_slackChannel].id;
-		Swift::Presence::ref presence = Swift::Presence::create();
-		presence->setFrom(Swift::JID("", m_uinfo.jid, "default"));
-		presence->setTo(m_component->getJID());
-		presence->setType(Swift::Presence::Available);
-		presence->addPayload(boost::shared_ptr<Swift::Payload>(new Swift::MUCPayload()));
-		m_component->getFrontend()->onPresenceReceived(presence);
+		m_api->channelsInvite(m_slackChannel, m_rtm->getSelfId(), boost::bind(&SlackSession::handleSlackChannelInvite, this, _1, _2, _3, _4));
 	}
 	else {
 		m_api->channelsCreate(m_slackChannel, boost::bind(&SlackSession::handleSlackChannelCreate, this, _1, _2, _3, _4));
diff --git a/spectrum/src/frontends/slack/SlackSession.h b/spectrum/src/frontends/slack/SlackSession.h
index 7cb3962838cec43bed1154f1779ceaf51317244c..9164a6dedf7b7ca45b40ae38dffe0940d6713255 100644
--- a/spectrum/src/frontends/slack/SlackSession.h
+++ b/spectrum/src/frontends/slack/SlackSession.h
@@ -75,6 +75,7 @@ class SlackSession {
 
 		void handleSlackChannelCreate(HTTPRequest *req, bool ok, rapidjson::Document &resp, const std::string &data);
 		void handleSlackChannelList(HTTPRequest *req, bool ok, rapidjson::Document &resp, const std::string &data);
+		void handleSlackChannelInvite(HTTPRequest *req, bool ok, rapidjson::Document &resp, const std::string &data);
 
 		void sendOnlineBuddies();