diff --git a/youtube_dl/extractor/panopto.py b/youtube_dl/extractor/panopto.py
index beb46f5ae..f76c1be71 100644
--- a/youtube_dl/extractor/panopto.py
+++ b/youtube_dl/extractor/panopto.py
@@ -287,7 +287,7 @@ class PanoptoIE(PanoptoBaseIE):
         return map(
             lambda u: cls.url_result(u, cls.ie_key()),
             orderedSet(m.group('url') for m in itertools.chain(
-                re.finditer(embed_re, webpage) for embed_re in cls._EMBED_REGEX)))
+                *(re.finditer(embed_re, webpage) for embed_re in cls._EMBED_REGEX))))
 
     def _mark_watched(self, base_url, video_id, delivery_info):
         duration = traverse_obj(delivery_info, ('Delivery', 'Duration'), expected_type=float)