diff --git a/youtube_dl/extractor/tumblr.py b/youtube_dl/extractor/tumblr.py
index 71ced8018..61b0c1db6 100644
--- a/youtube_dl/extractor/tumblr.py
+++ b/youtube_dl/extractor/tumblr.py
@@ -165,7 +165,10 @@ class TumblrIE(InfoExtractor):
         if iframe_url is None:
             return self.url_result(redirect_url, 'Generic')
 
-        iframe = self._download_webpage(iframe_url, video_id, 'Downloading iframe page',
+        iframe = self._download_webpage(
+            iframe_url,
+            video_id,
+            'Downloading iframe page',
             headers={'Referer': url})
 
         duration = None