diff --git a/birb/modules/world/maps/tiled/mixins.lua b/birb/modules/world/maps/tiled/mixins.lua
index ad0162c..a809931 100644
--- a/birb/modules/world/maps/tiled/mixins.lua
+++ b/birb/modules/world/maps/tiled/mixins.lua
@@ -5,8 +5,8 @@ local TiledMixins = Object:extend()
 
 function TiledMixins:batchActor(objectlayer, object, layerx, layery)
     local name = objectlayer.name
-    local gwidth = object.properties.gwidth or self.sti.tilewidth
-    local gheight = object.properties.gheight or self.sti.tileheight
+    local gwidth = object.properties.gwidth or self.wrapper.sti.tilewidth
+    local gheight = object.properties.gheight or self.wrapper.sti.tileheight
     local x = object.x + layerx
     local y = object.y + layery
     local z = object.properties.z or 0