diff --git a/configurations/importer.py b/configurations/importer.py
index e43f2b8..38bddbf 100644
--- a/configurations/importer.py
+++ b/configurations/importer.py
@@ -124,8 +124,8 @@ class ConfigurationImporter(object):
                 def stylize(text):
                     return colorize(text, fg='green')
 
-            if self.argv[1] == 'runserver' \
-                    and os.environ.get('RUN_MAIN') == 'true':
+            if (self.argv[1] == 'runserver'
+                    and os.environ.get('RUN_MAIN') == 'true'):
 
                 message = ("django-configurations version {0}, using "
                            "configuration '{1}'".format(__version__,
diff --git a/configurations/values.py b/configurations/values.py
index af53b62..0f96e3d 100644
--- a/configurations/values.py
+++ b/configurations/values.py
@@ -52,8 +52,8 @@ class Value(object):
             instance.late_binding = kwargs.get('late_binding')
         if not instance.late_binding:
             instance.__init__(*args, **kwargs)
-            if (instance.environ and instance.environ_name) \
-                    or (not instance.environ and instance.default):
+            if ((instance.environ and instance.environ_name)
+                    or (not instance.environ and instance.default)):
                 instance = instance.setup(instance.environ_name)
         return instance
 
diff --git a/tox.ini b/tox.ini
index 5f3454b..0f8c5b3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -49,4 +49,4 @@ deps = flake8
 
 [flake8]
 exclude = .tox
-ignore = E501,E127,E128,E124
+ignore = E501,E127,E128,E124,W503