diff --git a/robotgame/block.py b/robotgame/block.py
index 7e2e71d..a4d76f0 100644
--- a/robotgame/block.py
+++ b/robotgame/block.py
@@ -36,7 +36,8 @@ class Block(worldobject.WorldObject):
                  width=1, height=1, blit_area=None):
         self.__dict__.update(locals())
         worldobject.WorldObject.__init__(self, level, x, y,
-                                         movable=movable, visible=visible)
+                                         movable=movable, visible=visible,
+                                         blit_area=blit_area)
 
         for i in range(width):
             for j in range(height):
diff --git a/robotgame/worldobject.py b/robotgame/worldobject.py
index cc178ff..e81b90b 100644
--- a/robotgame/worldobject.py
+++ b/robotgame/worldobject.py
@@ -31,7 +31,8 @@ import copy
 class WorldObject(object):
     def __init__(self, level, x, y, z=0, direction=(1, 0), speed=4,
                  tile_x=64, tile_y=48,
-                 movable=False, blocking=True, is_moving=False, visible=True):
+                 movable=False, blocking=True, is_moving=False, visible=True,
+                 blit_area=None):
         self.__dict__.update(locals())
 
         self.init_x = self.move_x = self.x = x - (x % self.tile_x)