diff --git a/src/_zkapauthorizer/tests/test_storage_server.py b/src/_zkapauthorizer/tests/test_storage_server.py
index cfb17e9ce30ad7df787699dd6806f5f7a6f21188..49e6d606274b3102f047379ee58fece86c18323a 100644
--- a/src/_zkapauthorizer/tests/test_storage_server.py
+++ b/src/_zkapauthorizer/tests/test_storage_server.py
@@ -674,7 +674,7 @@ class PassValidationTests(TestCase):
         )
 
         after_count = read_count(self.storage_server)
-        after_bucket = read_bucket(self.storage_server)
+        after_bucket = read_bucket(self.storage_server, size)
 
         note("bucket_number {}".format(bucket_number))