diff --git a/scrapy/responsetypes.py b/scrapy/responsetypes.py
index 6ad41066f..9592dcd73 100644
--- a/scrapy/responsetypes.py
+++ b/scrapy/responsetypes.py
@@ -5,6 +5,7 @@ based on different criteria.
 from mimetypes import MimeTypes
 from pkgutil import get_data
 from io import StringIO
+
 from xtractmime import extract_mime
 
 from scrapy.http import Response