diff --git a/youtube_dl/extractor/prosiebensat1.py b/youtube_dl/extractor/prosiebensat1.py
index a064de05e..84d04aa69 100644
--- a/youtube_dl/extractor/prosiebensat1.py
+++ b/youtube_dl/extractor/prosiebensat1.py
@@ -127,7 +127,7 @@ class ProSiebenSat1IE(ProSiebenSat1BaseIE):
                         (?:www\.)?
                         (?:
                             (?:
-                                prosieben|prosiebenmaxx|sixx|sat1(?:gold)?|kabeleins|the-voice-of-germany|7tv|kabeleinsdoku
+                                prosieben(?:maxx)?|sixx|sat1(?:gold)?|kabeleins(?:doku)?|the-voice-of-germany|7tv
                             )\.(?:de|at|ch)|
                             ran\.de|fem\.com
                         )