diff --git a/scrapy/extensions/feedexport.py b/scrapy/extensions/feedexport.py
index 2b4594ad8..f6bc460ea 100644
--- a/scrapy/extensions/feedexport.py
+++ b/scrapy/extensions/feedexport.py
@@ -131,9 +131,12 @@ class S3FeedStorage(BlockingFeedStorage):
 
     @classmethod
     def from_crawler(cls, crawler, uri):
-        return cls(uri, crawler.settings['AWS_ACCESS_KEY_ID'],
-                   crawler.settings['AWS_SECRET_ACCESS_KEY'],
-                   crawler.settings['FEED_STORAGE_S3_ACL'])
+        return cls(
+            uri=uri,
+            access_key=crawler.settings['AWS_ACCESS_KEY_ID'],
+            secret_key=crawler.settings['AWS_SECRET_ACCESS_KEY'],
+            acl=crawler.settings['FEED_STORAGE_S3_ACL']
+        )
 
     def _store_in_thread(self, file):
         file.seek(0)