diff --git a/backend/app/dav/carddav.py b/backend/app/dav/carddav.py
index 88fdb74..8c212d3 100644
--- a/backend/app/dav/carddav.py
+++ b/backend/app/dav/carddav.py
@@ -140,7 +140,8 @@ _DAV_HEADERS = {'DAV': '1, 2, 3, addressbook'}
 @dav_bp.route('/<username>/<ab_part>', methods=['OPTIONS'])
 def ab_options(username, ab_part):
     if not ab_part.startswith('ab-'):
-        return Response('', 404)
+        from .caldav import options as _cal_options
+        return _cal_options(subpath=f'{username}/{ab_part}')
     return Response('', 200, {
         'DAV': '1, 2, 3, addressbook',
         'Allow': 'OPTIONS, PROPFIND, REPORT, GET, PUT, DELETE, PROPPATCH, MKCOL',
@@ -152,7 +153,8 @@ def ab_options(username, ab_part):
 @basic_auth
 def ab_propfind(username, ab_part):
     if not ab_part.startswith('ab-'):
-        return Response('Not found', 404)
+        from .caldav import propfind as _cal_propfind
+        return _cal_propfind(subpath=f'{username}/{ab_part}')
     user: User = request.dav_user
     if username != user.username:
         return Response('', 403)