diff --git a/mods/ENTITIES/mobs_mc/ender_dragon.lua b/mods/ENTITIES/mobs_mc/ender_dragon.lua
index db29b63ae..a6f404275 100644
--- a/mods/ENTITIES/mobs_mc/ender_dragon.lua
+++ b/mods/ENTITIES/mobs_mc/ender_dragon.lua
@@ -60,7 +60,7 @@ mobs:register_mob("mobs_mc:enderdragon", {
 	},
 	ignores_nametag = true,
 	do_custom = function(self)
-		mcl_bossbars.update_boss(self, "Ender Dragon", "light_purple")
+		mcl_bossbars.update_boss(self.object, "Ender Dragon", "light_purple")
 		for _, obj in ipairs(minetest.get_objects_inside_radius(self.object:get_pos(), 80)) do
 			local luaentity = obj:get_luaentity()
 			if luaentity and luaentity.name == "mcl_end:crystal" then
diff --git a/mods/ENTITIES/mobs_mc/wither.lua b/mods/ENTITIES/mobs_mc/wither.lua
index 8e7f7eb95..2d53cc547 100644
--- a/mods/ENTITIES/mobs_mc/wither.lua
+++ b/mods/ENTITIES/mobs_mc/wither.lua
@@ -73,7 +73,7 @@ mobs:register_mob("mobs_mc:wither", {
 			self.object:set_properties({textures={self.base_texture}})
 			self.armor = {undead = 80, fleshy = 80}
 		end
-		mcl_bossbars.update_boss(self, "Wither", "dark_purple")
+		mcl_bossbars.update_boss(self.object, "Wither", "dark_purple")
 	end,
 	on_spawn = function(self)
 		minetest.sound_play("mobs_mc_wither_spawn", {object=self.object, gain=1.0, max_hear_distance=64})