diff --git a/src/main/scala/scatan/model/map/HexagonTiledMap.scala b/src/main/scala/scatan/model/map/HexagonTiledMap.scala
index 33a9f29..3f8472f 100644
--- a/src/main/scala/scatan/model/map/HexagonTiledMap.scala
+++ b/src/main/scala/scatan/model/map/HexagonTiledMap.scala
@@ -17,7 +17,7 @@ type Spot = StructureSpot | RoadSpot
 
 /** A map made of hexagonal tiles.
   */
-class HexagonalTiledMap(layers: Int)
+abstract class HexagonalTiledMap(layers: Int)
     extends UndirectedGraph[StructureSpot, RoadSpot]
     with UndirectedGraphOps[StructureSpot, RoadSpot]: