1 files changed, 1 insertions, 1 deletions
diff --git a/lib/terrain.rb b/lib/terrain.rb
index 795bf6d..f3a1a60 100755
--- a/lib/terrain.rb
+++ b/lib/terrain.rb
@@ -4,7 +4,7 @@ class Terrain
   end
 
   def move_forward( heading, location)
-    new_location = heading.forward(location)
+    new_location = heading.forward(location.clone)
     if( new_location[:x] < @map[:x] && new_location[:x] > 0 && new_location[:y] < @map[:y] && new_location[:y] > 0)
       location[:x] = new_location[:x]
       location[:y] = new_location[:y]