diff --git a/youtube_dl/extractor/gaskrank.py b/youtube_dl/extractor/gaskrank.py
index db8e9be93..c40d35772 100644
--- a/youtube_dl/extractor/gaskrank.py
+++ b/youtube_dl/extractor/gaskrank.py
@@ -5,6 +5,7 @@ from re import sub
 from .common import InfoExtractor
 from ..utils import js_to_json
 
+
 class GaskrankIE(InfoExtractor):
     _VALID_URL = r'https?://(?:www\.)?gaskrank\.tv/tv(?:/[^/]+)+/(?P<id>[^/]+).htm'
     _TEST = {