diff --git a/src/c3nav/mapdata/management/commands/importsvg.py b/src/c3nav/mapdata/management/commands/importsvg.py
index c33a7086..0dfe8e5c 100644
--- a/src/c3nav/mapdata/management/commands/importsvg.py
+++ b/src/c3nav/mapdata/management/commands/importsvg.py
@@ -183,7 +183,7 @@ class Command(BaseCommand):
                 for polygon in self.parse_svg_data(path.attrib['d']):
                     if len(polygon) < 3:
                         continue
-                    polygon = Polygon(polygon)
+                    polygon = Polygon(polygon).buffer(0)
                     polygon = translate(polygon, xoff=-offset_x, yoff=-offset_y)
                     polygon = scale(polygon, xfact=1, yfact=-1, origin=(0, svg_height/2))
                     polygon = scale(polygon, xfact=width / svg_width, yfact=height / svg_height, origin=(0, 0))
diff --git a/src/c3nav/mapdata/models/geometry/space.py b/src/c3nav/mapdata/models/geometry/space.py
index 416f8048..a59c0b81 100644
--- a/src/c3nav/mapdata/models/geometry/space.py
+++ b/src/c3nav/mapdata/models/geometry/space.py
@@ -85,8 +85,8 @@ class SpaceGeometryMixin(GeometryMixin):
     def register_change(self, force=False):
         space = self.space
         if force or self._state.adding or self.all_geometry_changed or self.geometry_changed:
-            changed_geometries.register(space.level_id, space.geometry.intersection(
-                unwrap_geom(self.geometry if force or self._state.adding else self.get_changed_geometry())
+            changed_geometries.register(space.level_id, space.geometry.buffer(0).intersection(
+                unwrap_geom(self.geometry if force or self._state.adding else self.get_changed_geometry()).buffer(0)
             ))
 
     def details_display(self, **kwargs):