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-rw-r--r--youtube_dl/extractor/youtube.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index a6eefdf4e..148b20160 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -488,8 +488,8 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
def gen_sig_code(idxs):
def _genslice(start, end, step):
starts = u'' if start == 0 else str(start)
- ends = u':%d' % (end+step)
- steps = u'' if step == 1 else (':%d' % step)
+ ends = (u':%d' % (end+step)) if end + step >= 0 else u':'
+ steps = u'' if step == 1 else (u':%d' % step)
return u's[%s%s%s]' % (starts, ends, steps)
step = None