--- a/plugins/muc/muc.lib.lua	Wed Jan 10 15:15:25 2018 +0000
+++ b/plugins/muc/muc.lib.lua	Thu Mar 08 17:36:36 2018 +0100
@@ -231,6 +231,7 @@
 	return st.reply(stanza):query("http://jabber.org/protocol/disco#info")
 		:tag("identity", {category="conference", type="text", name=self:get_name()}):up()
 		:tag("feature", {var="http://jabber.org/protocol/muc"}):up()
+		:tag("feature", {var="http://jabber.org/protocol/muc#stable_id"}):up()
 		:tag("feature", {var=self:get_password() and "muc_passwordprotected" or "muc_unsecured"}):up()
 		:tag("feature", {var=self:is_moderated() and "muc_moderated" or "muc_unmoderated"}):up()
 		:tag("feature", {var=self:is_members_only() and "muc_membersonly" or "muc_open"}):up()