--- a/plugins/muc/muc.lib.lua	Sun Dec 13 16:27:00 2020 +0100
+++ b/plugins/muc/muc.lib.lua	Tue Dec 15 13:37:05 2020 +0000
@@ -1397,8 +1397,8 @@
 						occupant = occupant;
 					});
 			elseif is_semi_anonymous and
-				(old_role == "moderator" and occupant.role ~= "moderator") or
-				(old_role ~= "moderator" and occupant.role == "moderator") then -- Has gained or lost moderator status
+				((old_role == "moderator" and occupant.role ~= "moderator") or
+				(old_role ~= "moderator" and occupant.role == "moderator")) then -- Has gained or lost moderator status
 				-- Send everyone else's presences (as jid visibility has changed)
 				for real_jid in occupant:each_session() do
 					self:send_occupant_list(real_jid, function(occupant_jid, occupant) --luacheck: ignore 212 433