diff --git a/src/_zkapauthorizer/config.py b/src/_zkapauthorizer/config.py
index b6f9f19484f4058d6bfd469846e614a2cee3df03..87a095620835dc5db374c001219755c72018a0b2 100644
--- a/src/_zkapauthorizer/config.py
+++ b/src/_zkapauthorizer/config.py
@@ -27,6 +27,7 @@ from .lease_maintenance import LeaseMaintenanceConfig
 
 from allmydata.node import _Config
 
+
 class _EmptyConfig(object):
     """
     Weakly pretend to be a Tahoe-LAFS configuration object with no