diff --git a/scrapy/downloadermiddlewares/redirect.py b/scrapy/downloadermiddlewares/redirect.py
index 26677e527..ae4ad8891 100644
--- a/scrapy/downloadermiddlewares/redirect.py
+++ b/scrapy/downloadermiddlewares/redirect.py
@@ -57,6 +57,8 @@ class RedirectMiddleware(BaseRedirectMiddleware):
     Handle redirection of requests based on response status
     and meta-refresh html tag.
     """
+    allowed_status = (301, 302, 303, 307)
+
     def process_response(self, request, response, spider):
         if (request.meta.get('dont_redirect', False) or
                 response.status in getattr(spider, 'handle_httpstatus_list', []) or
@@ -64,8 +66,7 @@ class RedirectMiddleware(BaseRedirectMiddleware):
                 request.meta.get('handle_httpstatus_all', False)):
             return response
 
-        allowed_status = (301, 302, 303, 307)
-        if 'Location' not in response.headers or response.status not in allowed_status:
+        if 'Location' not in response.headers or response.status not in self.allowed_status:
             return response
 
         location = safe_url_string(response.headers['location'])