diff --git a/rest_framework/authentication.py b/rest_framework/authentication.py
index 74e0963ae..5ad7004aa 100644
--- a/rest_framework/authentication.py
+++ b/rest_framework/authentication.py
@@ -14,6 +14,7 @@ from django.utils.translation import ugettext_lazy as _
 from rest_framework import HTTP_HEADER_ENCODING, exceptions
 from rest_framework.request import Request as DRFRequest
 
+
 def get_authorization_header(request):
     """
     Return request's 'Authorization:' header, as a bytestring.