1 files changed, 10 insertions, 2 deletions
diff --git a/core/src/ch/asynk/rustanddust/engine/TileSet.java b/core/src/ch/asynk/rustanddust/engine/TileSet.java
index 76fa3a1..9531549 100644
--- a/core/src/ch/asynk/rustanddust/engine/TileSet.java
+++ b/core/src/ch/asynk/rustanddust/engine/TileSet.java
@@ -1,8 +1,8 @@
 package ch.asynk.rustanddust.engine;
 
-import java.util.LinkedHashSet;
+import ch.asynk.rustanddust.engine.util.ArrayListIt;
 
-public class TileSet extends LinkedHashSet<Tile>
+public class TileSet extends ArrayListIt<Tile>
 {
     private final Board board;
 
@@ -17,4 +17,12 @@ public class TileSet extends LinkedHashSet<Tile>
         for (Tile tile : this)
             board.enableOverlayOn(tile, i, enable);
     }
+
+    @Override
+    public boolean add(Tile tile)
+    {
+        if (contains(tile)) return false;
+        super.add(tile);
+        return true;
+    }
 }