diff --git a/youtube_dl/extractor/archiveorg.py b/youtube_dl/extractor/archiveorg.py
index 0d69d9ad5..c6f50ff8c 100644
--- a/youtube_dl/extractor/archiveorg.py
+++ b/youtube_dl/extractor/archiveorg.py
@@ -48,7 +48,7 @@ class ArchiveOrgIE(InfoExtractor):
 
         def get_optional(metadata, field):
             return metadata.get(field, [None])[0]
-        
+
         def convert_relative_to_absolute_thumbnail(metadata):
             if not metadata['thumbnail'].startswith('http'):
                 metadata.update({'thumbnail': ''.join(('http://archive.org', metadata.get('thumbnail')))})
@@ -70,4 +70,4 @@ class ArchiveOrgIE(InfoExtractor):
         else:
             for entry in info['entries']:
                 convert_relative_to_absolute_thumbnail(entry)
-        return info
\ No newline at end of file
+        return info