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-rw-r--r--youtube_dl/utils.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index 81ff78807..fdf41b025 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -4257,7 +4257,7 @@ def update_url(url, **kwargs):
     query = kwargs.pop('query_update', None)
     if query:
         qs = compat_parse_qs(url.query)
-        qs.update(query)
+        qs.update((k, [v]) for k, v in query.items())
         kwargs['query'] = compat_urllib_parse_urlencode(qs, True)
         kwargs = compat_kwargs(kwargs)
     return compat_urllib_parse.urlunparse(url._replace(**kwargs))