diff --git a/test/test_youtube_signature.py b/test/test_youtube_signature.py
index 5bb89710c..1c5f667f5 100644
--- a/test/test_youtube_signature.py
+++ b/test/test_youtube_signature.py
@@ -175,8 +175,8 @@ _NSIG_TESTS = [
         '7X-he4jjvMx7BCX', 'sViSydX8IHtdWA',
     ),
     (
-       'https://www.youtube.com/s/player/20dfca59/player_ias.vflset/en_US/base.js',
-       '-fLCxedkAk4LUTK2', 'O8kfRq1y1eyHGw',
+        'https://www.youtube.com/s/player/20dfca59/player_ias.vflset/en_US/base.js',
+        '-fLCxedkAk4LUTK2', 'O8kfRq1y1eyHGw',
     ),
 ]
 
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index 54ce8dd5a..509e374a4 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -1676,7 +1676,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
                               \.\s*get\s*\(\s*(?(b)(?P=b)|"n{1,2}")(?:\s*\)){2}\s*
                               &&\s*\(\s*(?(c)(?P=c)|(?P=b))
                           )
-                    )\s*=\s*                   
+                    )\s*=\s*
                 (?P<nfunc>[a-zA-Z_$][\w$]*)(?:\s*\[(?P<idx>\d+)\])?\s*\(\s*[\w$]+\s*\)
             ''', jscode, 'Initial JS player n function name', group=('nfunc', 'idx'),
             default=(None, None))