diff --git a/robotgame/level1.py b/robotgame/level1.py
index c1729ff..3bbd036 100644
--- a/robotgame/level1.py
+++ b/robotgame/level1.py
@@ -71,7 +71,7 @@ class Level1(level.Level):
                                                 self.imgs['wall_outside'],
                                                 width=3))
             self.objects.append(block.InvisBlock(self, i * 64,
-                                                 self.size[1] * 48))
+                                                 self.size[1]))
         for i in range(self.size[1] / 48):
             self.objects.append(block.InvisBlock(self, - 64,
                                                  i * 48))