diff --git a/sshagent/server.py b/sshagent/server.py
index 9bb78f2..b055b60 100644
--- a/sshagent/server.py
+++ b/sshagent/server.py
@@ -11,6 +11,7 @@ from . import protocol
 from . import formats
 from . import util
 
+
 @contextlib.contextmanager
 def unix_domain_socket_server(sock_path):
     log.debug('serving on SSH_AUTH_SOCK=%s', sock_path)
@@ -28,6 +29,7 @@ def unix_domain_socket_server(sock_path):
     finally:
         os.remove(sock_path)
 
+
 def handle_connection(conn, keys, signer):
     try:
         log.debug('welcome agent')
@@ -41,6 +43,7 @@ def handle_connection(conn, keys, signer):
         log.exception('error')
         raise
 
+
 def server_thread(server, keys, signer):
     log.debug('server thread started')
     while True:
diff --git a/sshagent/trezor_agent.py b/sshagent/trezor_agent.py
index 9b6e477..ace191b 100644
--- a/sshagent/trezor_agent.py
+++ b/sshagent/trezor_agent.py
@@ -7,6 +7,7 @@ from . import trezor
 from . import server
 from . import formats
 
+
 def main():
     fmt = '%(asctime)s %(levelname)-12s %(message)-100s [%(filename)s]'
     p = argparse.ArgumentParser()
diff --git a/sshagent/util.py b/sshagent/util.py
index b837b71..49a925c 100644
--- a/sshagent/util.py
+++ b/sshagent/util.py
@@ -1,11 +1,13 @@
 import struct
 import io
 
+
 def send(conn, data, fmt=None):
     if fmt:
         data = struct.pack(fmt, *data)
     conn.sendall(data)
 
+
 def recv(conn, size):
     try:
         fmt = size
@@ -35,12 +37,14 @@ def read_frame(conn):
     size, = recv(conn, '>L')
     return recv(conn, size)
 
+
 def bytes2num(s):
     res = 0
     for i, c in enumerate(reversed(bytearray(s))):
         res += c << (i * 8)
     return res
 
+
 def num2bytes(value, size):
     res = []
     for i in range(size):
@@ -49,9 +53,11 @@ def num2bytes(value, size):
     assert value == 0
     return bytearray(list(reversed(res)))
 
+
 def pack(fmt, *args):
     return struct.pack('>' + fmt, *args)
 
+
 def frame(*msgs):
     res = io.BytesIO()
     for msg in msgs: