diff --git a/units/rat.py b/units/rat.py
index fb5b8fe..df31f1d 100644
--- a/units/rat.py
+++ b/units/rat.py
@@ -202,7 +202,9 @@ class Rat(Unit):
                     return
                 # Internal tunnel passage or crossroad: draw the rat normally
                 # so it stays visible while walking through the tunnel.
-                self.game.render_engine.draw_image(self.render_x, self.render_y, image, anchor="nw", tag="unit")
+                frame = min(3, int(self.partial_move * 4))
+                source_rect = (frame * image_size[0], 0, image_size[0], image_size[1])
+                self.game.render_engine.draw_image(self.render_x, self.render_y, image, anchor="nw", tag="unit", source_rect=source_rect)
                 return
             if not self.game.map.is_empty(cell_x, cell_y):
                 return