diff --git a/src/_zkapauthorizer/foolscap.py b/src/_zkapauthorizer/foolscap.py
index 52a43c6daea142758e1fd8b40a727d9b7e21fe9d..67b1b2f7c0b2d55c76f8a37cf7d4e6b8cf499be6 100644
--- a/src/_zkapauthorizer/foolscap.py
+++ b/src/_zkapauthorizer/foolscap.py
@@ -6,8 +6,7 @@ from foolscap.constraint import (
     ByteStringConstraint,
 )
 from foolscap.api import (
-    ChoiceOf,
-    SetOf,
+    Any,
     DictOf,
     ListOf,
 )
@@ -17,7 +16,6 @@ from foolscap.remoteinterface import (
 )
 
 from allmydata.interfaces import (
-    MAX_BUCKETS,
     StorageIndex,
     RIStorageServer,
     Offset,