--- a/mod_rest/mod_rest.lua	Wed Dec 29 18:31:40 2021 +0100
+++ b/mod_rest/mod_rest.lua	Wed Dec 29 19:40:28 2021 +0100
@@ -297,7 +297,7 @@
 		return post_errors.new("parse", ctx);
 	end
 
-	if payload.attr.xmlns then
+	if (payload.attr.xmlns or "jabber:client") ~= "jabber:client" then
 		return post_errors.new("xmlns");
 	elseif payload.name ~= "message" and payload.name ~= "presence" and payload.name ~= "iq" then
 		return post_errors.new("name");