diff --git a/squirrelbattle/mapgeneration/broguelike.py b/squirrelbattle/mapgeneration/broguelike.py
index 65eb337..2425df7 100644
--- a/squirrelbattle/mapgeneration/broguelike.py
+++ b/squirrelbattle/mapgeneration/broguelike.py
@@ -208,7 +208,7 @@ class Generator:
         # place an exit ladder
         y, x = randint(0, height - 1), randint(0, width - 1)
         while level[y][x] != Tile.FLOOR or \
-                sum([t.can_walk() for t in Map.neighbourhood(level, y, x, large=True)]) < 5:
+                any([t.is_wall() for t in Map.neighbourhood(level, y, x, large=True)]):
             y, x = randint(0, height - 1), randint(0, width - 1)
         level[sy][sx] = Tile.LADDER