diff --git a/moonwalk.py b/moonwalk.py
index 58a4f9a..f7d859d 100644
--- a/moonwalk.py
+++ b/moonwalk.py
@@ -100,7 +100,7 @@ class Canvas:
         for i, field in enumerate(dataclasses.fields(self.params)):
             self.labels[field.name] = pyglet.text.Label(f"{field.name}: {field.default}", x=20, y=30 + 15*(i+1), color=(255,255,255,255), batch=self.renderer.batch_info)
         
-        self.track_shapes = defaultdict(lambda: pyglet.shapes.Rectangle(0,0,0,0,(0,255,0),batch=self.renderer.batch_bounding_boxes))
+        self.track_shapes = defaultdict(lambda: pyglet.shapes.Box(0,0,0,0,color=(0,255,0),thickness=2, batch=self.renderer.batch_bounding_boxes))
 
         self.renderer.window.set_handler('on_refresh', self.on_refresh)