--- a/plugins/mod_pubsub.lua	Mon Apr 15 21:26:20 2013 +0100
+++ b/plugins/mod_pubsub.lua	Wed Apr 17 14:20:02 2013 +0100
@@ -190,7 +190,11 @@
 		return origin.send(pubsub_error_reply(stanza, "nodeid-required"));
 	end
 	local item = publish:get_child("item");
-	local id = (item and item.attr.id) or uuid_generate();
+	local id = (item and item.attr.id);
+	if not id then
+		id = uuid_generate();
+		item.attr.id = id;
+	end
 	local ok, ret = service:publish(node, stanza.attr.from, id, item);
 	local reply;
 	if ok then