diff --git a/src/c3nav/mapdata/models/level.py b/src/c3nav/mapdata/models/level.py
index 7b318db4..9d00329d 100644
--- a/src/c3nav/mapdata/models/level.py
+++ b/src/c3nav/mapdata/models/level.py
@@ -148,6 +148,7 @@ class Level(SpecificLocation, models.Model):
 
         # calculate walls
         wall_geometry = building_geometries.difference(space_geometries).difference(door_geometries)
+        wall_geometry = wall_geometry.difference(hole_geometries)
 
         # draw wall shadow
         if effects: