diff --git a/youtube_dl/extractor/ustream.py b/youtube_dl/extractor/ustream.py
index 83e166264..9e860aeb7 100644
--- a/youtube_dl/extractor/ustream.py
+++ b/youtube_dl/extractor/ustream.py
@@ -75,7 +75,7 @@ class UstreamIE(InfoExtractor):
     @staticmethod
     def _extract_url(webpage):
         mobj = re.search(
-            r'<iframe[^>]+?src=(["\'])(?P<url>http://(?:www\.ustream\.tv|video\.ibm\.com)/embed/.+?)\1', webpage)
+            r'<iframe[^>]+?src=(["\'])(?P<url>http://(?:www\.)?(?:ustream\.tv|video\.ibm\.com)/embed/.+?)\1', webpage)
         if mobj is not None:
             return mobj.group('url')