diff --git a/HACKING.rst b/HACKING.rst
index 1cee4956..4a039312 100644
--- a/HACKING.rst
+++ b/HACKING.rst
@@ -1,4 +1,4 @@
 oslo.service Style Commandments
-======================================================
+===============================
 
 Read the OpenStack Style Commandments https://docs.openstack.org/hacking/latest/
diff --git a/oslo_service/periodic_task.py b/oslo_service/periodic_task.py
index caa99e40..ea3a9e14 100644
--- a/oslo_service/periodic_task.py
+++ b/oslo_service/periodic_task.py
@@ -14,20 +14,18 @@
 import copy
 import logging
 import random
+import six
 import time
 
+from oslo_service._i18n import _
+from oslo_service import _options
+from oslo_utils import reflection
+
 if hasattr(time, 'monotonic'):
     now = time.monotonic
 else:
     from monotonic import monotonic as now  # noqa
 
-from oslo_utils import reflection
-import six
-
-from oslo_service._i18n import _
-from oslo_service import _options
-
-
 LOG = logging.getLogger(__name__)
 
 DEFAULT_INTERVAL = 60.0
diff --git a/oslo_service/service.py b/oslo_service/service.py
index 133a6a2b..2924b1ee 100644
--- a/oslo_service/service.py
+++ b/oslo_service/service.py
@@ -139,8 +139,8 @@ class SignalHandler(object):
         self._ignore_signals = ('SIG_DFL', 'SIG_IGN')
         self._signals_by_name = dict((name, getattr(signal, name))
                                      for name in dir(signal)
-                                     if name.startswith("SIG")
-                                     and name not in self._ignore_signals)
+                                     if name.startswith("SIG") and
+                                     name not in self._ignore_signals)
         self.signals_to_name = dict(
             (sigval, name)
             for (name, sigval) in self._signals_by_name.items())
diff --git a/test-requirements.txt b/test-requirements.txt
index eeedfefe..f52f1860 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,7 +3,7 @@
 # process, which may cause wedges in the gate later.
 
 fixtures>=3.0.0 # Apache-2.0/BSD
-hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
+hacking>=1.1.0,<1.2.0 # Apache-2.0
 mock>=2.0.0 # BSD
 oslotest>=3.2.0 # Apache-2.0
 requests>=2.14.2 # Apache-2.0
diff --git a/tox.ini b/tox.ini
index a111533b..abbb0799 100644
--- a/tox.ini
+++ b/tox.ini
@@ -38,9 +38,10 @@ commands = python setup.py test --coverage --coverage-package-name=oslo_service
 
 [flake8]
 # E123, E125 skipped as they are invalid PEP-8.
+# E731 skipped as assign a lambda expression
 
 show-source = True
-ignore = E123,E125
+ignore = E123,E125,E731
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
 
 [hacking]