diff --git a/src/_zkapauthorizer/tests/test_client_resource.py b/src/_zkapauthorizer/tests/test_client_resource.py
index 292c505241c7a479b64300c4117a424cf61cf661..d0be44858a5fd4011d4aedce0477a84c35322329 100644
--- a/src/_zkapauthorizer/tests/test_client_resource.py
+++ b/src/_zkapauthorizer/tests/test_client_resource.py
@@ -73,7 +73,6 @@ from twisted.web.resource import IResource, getChildForRequest
 
 from .. import __version__ as zkapauthorizer_version
 from .._base64 import urlsafe_b64decode
-from ..config import get_configured_lease_duration
 from ..configutil import config_string_from_sections
 from ..model import (
     DoubleSpend,