diff --git a/repos/system_upgrade/common/libraries/testutils.py b/repos/system_upgrade/common/libraries/testutils.py
index a03033c5f8..afeb360a64 100644
--- a/repos/system_upgrade/common/libraries/testutils.py
+++ b/repos/system_upgrade/common/libraries/testutils.py
@@ -67,6 +67,7 @@ def error(self, *args):
     def __call__(self):
         return self
 
+
 def _make_default_config(actor_config_schema):
     """ Make a config dict populated with default values. """
     merged_schema = normalize_schemas((actor_config_schema, ))