diff --git a/src/c3nav/mapdata/api.py b/src/c3nav/mapdata/api.py
index 489f5af1..51c97a01 100644
--- a/src/c3nav/mapdata/api.py
+++ b/src/c3nav/mapdata/api.py
@@ -360,7 +360,7 @@ class LocationViewSetBase(RetrieveModelMixin, GenericViewSet):
             return redirect('../' + str(location.target.pk) + '/geometry/')
 
         return Response({
-            'id': location.id,
+            'id': location.pk,
             'level': getattr(location, 'level_id', None),
             'geometry': location.get_geometry(
                 detailed_geometry=MapdataViewSet.can_access_geometry(request, location)