diff --git a/src/_zkapauthorizer/_storage_server.py b/src/_zkapauthorizer/_storage_server.py
index 950e5cbf569bcffacd1ae72022d2ba1fc022f982..8ff606a549a15f07828a8af4d70c2142b864826e 100644
--- a/src/_zkapauthorizer/_storage_server.py
+++ b/src/_zkapauthorizer/_storage_server.py
@@ -30,7 +30,7 @@ from struct import calcsize, unpack
 from typing import Any, Dict, List, Optional, Tuple
 
 import attr
-from allmydata.interfaces import RIStorageServer, TestAndWriteVectorsForShares
+from allmydata.interfaces import TestAndWriteVectorsForShares
 from allmydata.storage.common import storage_index_to_dir
 from allmydata.storage.immutable import (
     BucketWriter,
diff --git a/src/_zkapauthorizer/tests/foolscap.py b/src/_zkapauthorizer/tests/foolscap.py
index dba7e9fdd965eab41304ed1c1acfaa774f2b2156..9512f47c234d0c7ade266b2a80fb6056b59c9524 100644
--- a/src/_zkapauthorizer/tests/foolscap.py
+++ b/src/_zkapauthorizer/tests/foolscap.py
@@ -18,7 +18,6 @@ Testing helpers related to Foolscap.
 
 import attr
 from allmydata.interfaces import RIStorageServer
-from allmydata.storage.server import StorageServer
 from foolscap.api import Any, Copyable, Referenceable, RemoteInterface
 from foolscap.copyable import CopyableSlicer, ICopyable
 from twisted.internet.defer import fail, succeed