diff --git a/tests/mockserver.py b/tests/mockserver.py
index d4e0362fb..a45277db9 100644
--- a/tests/mockserver.py
+++ b/tests/mockserver.py
@@ -6,7 +6,6 @@ from subprocess import Popen, PIPE
 from urllib.parse import urlencode
 
 from OpenSSL import SSL
-
 from twisted.web.server import Site, NOT_DONE_YET
 from twisted.web.resource import Resource
 from twisted.web.static import File