diff --git a/src/main/java/ch/fritteli/labyrinth/Labyrinth.java b/src/main/java/ch/fritteli/labyrinth/Labyrinth.java
index 93d19a9..17a4720 100644
--- a/src/main/java/ch/fritteli/labyrinth/Labyrinth.java
+++ b/src/main/java/ch/fritteli/labyrinth/Labyrinth.java
@@ -44,12 +44,14 @@ public class Labyrinth {
     private void hardenWalls(@NonNull final Tile tile, final int x, final int y) {
         if (x == 0) {
             tile.preventDiggingToOrFrom(Direction.LEFT);
-        } else if (x == this.width - 1) {
+        }
+        if (x == this.width - 1) {
             tile.preventDiggingToOrFrom(Direction.RIGHT);
         }
         if (y == 0) {
             tile.preventDiggingToOrFrom(Direction.TOP);
-        } else if (y == this.height - 1) {
+        }
+        if (y == this.height - 1) {
             tile.preventDiggingToOrFrom(Direction.BOTTOM);
         }
     }