diff --git a/src/c3nav/mapdata/render/geometry/level.py b/src/c3nav/mapdata/render/geometry/level.py
index 4e84163f..1fd7a94f 100644
--- a/src/c3nav/mapdata/render/geometry/level.py
+++ b/src/c3nav/mapdata/render/geometry/level.py
@@ -502,7 +502,7 @@ class LevelGeometries:
         self.walls_bottom.build_polyhedron(self._create_polyhedron, lower=0, upper=1, top=False)
 
         # unset heightareas, they are no loinger needed
-        self.all_walls = None
+        # self.all_walls = None # we don't remove all_walls because we use it for rendering tiles now
         self.ramps = None
         # self.heightareas = None
         self.vertices = None
diff --git a/src/c3nav/mapdata/render/renderer.py b/src/c3nav/mapdata/render/renderer.py
index 427e65ff..1c48de9d 100644
--- a/src/c3nav/mapdata/render/renderer.py
+++ b/src/c3nav/mapdata/render/renderer.py
@@ -137,8 +137,9 @@ class MapRenderer:
 
             # add walls, stroke_px makes sure that all walls are at least 1px thick on all zoom levels,
             walls = None
-            if not add_walls.is_empty or not geoms.walls.is_empty:
-                walls = geoms.walls.union(add_walls)
+            # we use all_walls instead of walls, because the short wall rendering stuff doesn't work
+            if not add_walls.is_empty or not geoms.all_walls.is_empty:
+                walls = geoms.all_walls.union(add_walls)
 
             walls_extended = geoms.walls_extended and full_levels
             if walls is not None: