diff --git a/source/astar.py b/source/astar.py
index 51634b3..3754bab 100644
--- a/source/astar.py
+++ b/source/astar.py
@@ -79,6 +79,8 @@ def goal_test(elem, goalstate):
 def tile_cost(tile):
     if tile.image == "resources/images/sampling.png":
         return 100
+    if tile.image == "resources/images/rock_dirt.png":
+        return 500
     else:
         return 1