diff --git a/init.lua b/init.lua
index cdddd1d..02b42d6 100644
--- a/init.lua
+++ b/init.lua
@@ -61,7 +61,7 @@ end
 
 player_monoids.make_monoid = monoid
 
-function mon_meta:add_change(player, value)
+function mon_meta:add_change(player, value, id)
 	local p_name = player:get_player_name()
 
 	local def = self.def