diff --git a/src/_zkapauthorizer/tests/foolscap.py b/src/_zkapauthorizer/tests/foolscap.py
index 9cef79e99c4cdc687f55ff8d627a646f5036a508..3a984bea163fd4c567812556f8229508c0cb8a2d 100644
--- a/src/_zkapauthorizer/tests/foolscap.py
+++ b/src/_zkapauthorizer/tests/foolscap.py
@@ -37,11 +37,7 @@ class RIEcho(RemoteInterface):
 
 @implementer(RIStorageServer)
 class StubStorageServer(object):
-    def set_implicit_bucket_lease_renewal(self, enabled):
-        pass
-
-    def set_implicit_slot_lease_renewal(self, enabled):
-        pass
+    pass
 
 
 def get_anonymous_storage_server():