diff --git a/src/c3nav/mapdata/models/level.py b/src/c3nav/mapdata/models/level.py
index 9d00329d..90336ab4 100644
--- a/src/c3nav/mapdata/models/level.py
+++ b/src/c3nav/mapdata/models/level.py
@@ -119,8 +119,9 @@ class Level(SpecificLocation, models.Model):
                 space.geometry = space.geometry.difference(building_geometries)
             columns_geom = cascaded_union(tuple(column.geometry for column in space.columns.all()))
             holes_geom = cascaded_union(tuple(hole.geometry for hole in space.holes.all()))
-            space.geometry = space.geometry.difference(columns_geom).difference(holes_geom)
+            space.geometry = space.geometry.difference(columns_geom)
             space.hole_geometries = holes_geom.intersection(space.geometry)
+            space.geometry = space.geometry.difference(holes_geom)
 
         space_geometries = cascaded_union(tuple(space.geometry for space in spaces))
         hole_geometries = cascaded_union(tuple(space.hole_geometries for space in spaces)).difference(space_geometries)