diff --git a/src/_zkapauthorizer/tests/test_controller.py b/src/_zkapauthorizer/tests/test_controller.py
index 7647440a34cdb71a76816620f965a66c9b4736a4..bec922bb0863dea1caee2df78cd783e713894d11 100644
--- a/src/_zkapauthorizer/tests/test_controller.py
+++ b/src/_zkapauthorizer/tests/test_controller.py
@@ -50,7 +50,6 @@ from testtools.matchers import (
     HasLength,
     AfterPreprocessing,
     MatchesStructure,
-    ContainsDict,
 )
 from testtools.twistedsupport import (
     succeeded,