diff --git a/trezor_agent/trezor/_factory.py b/trezor_agent/trezor/_factory.py
index 1bedf7f..8ea080d 100644
--- a/trezor_agent/trezor/_factory.py
+++ b/trezor_agent/trezor/_factory.py
@@ -16,6 +16,7 @@ def client():
     t.callback_PassphraseRequest = lambda msg: PassphraseAck(passphrase='')
     return t
 
+
 def identity_type(**kwargs):
     # pylint: disable=import-error
     from trezorlib.types_pb2 import IdentityType