diff --git a/radicale/storage/__init__.py b/radicale/storage/__init__.py
index f034b337..4e2e95dd 100644
--- a/radicale/storage/__init__.py
+++ b/radicale/storage/__init__.py
@@ -24,11 +24,10 @@ Take a look at the class ``BaseCollection`` if you want to implement your own.
 """
 
 import json
-from typing import Callable, ContextManager, Iterator, Optional, Set, cast
 import xml.etree.ElementTree as ET
 from hashlib import sha256
-from typing import (Iterable, Iterator, Mapping, Optional, Sequence, Set,
-                    Tuple, Union, overload)
+from typing import (Callable, ContextManager, Iterable, Iterator, Mapping,
+                    Optional, Sequence, Set, Tuple, Union, cast, overload)
 
 import vobject
 
diff --git a/radicale/storage/multifilesystem/discover.py b/radicale/storage/multifilesystem/discover.py
index 97d31930..5cff9789 100644
--- a/radicale/storage/multifilesystem/discover.py
+++ b/radicale/storage/multifilesystem/discover.py
@@ -16,9 +16,9 @@
 # You should have received a copy of the GNU General Public License
 # along with Radicale.  If not, see <http://www.gnu.org/licenses/>.
 
+import base64
 import os
 import posixpath
-import base64
 from typing import Callable, ContextManager, Iterator, Optional, Set, cast
 
 from radicale import pathutils, types