diff --git a/youtube_dl/extractor/heise.py b/youtube_dl/extractor/heise.py
index 8c1ba58d9..495ffb7dc 100644
--- a/youtube_dl/extractor/heise.py
+++ b/youtube_dl/extractor/heise.py
@@ -2,13 +2,13 @@
 from __future__ import unicode_literals
 
 from .common import InfoExtractor
+from .youtube import YoutubeIE
 from ..utils import (
     determine_ext,
     int_or_none,
     parse_iso8601,
     xpath_text,
 )
-from .youtube import YoutubeIE
 
 
 class HeiseIE(InfoExtractor):