diff --git a/youtube_dl/extractor/prosiebensat1.py b/youtube_dl/extractor/prosiebensat1.py
index 5091d8456..1245309a7 100644
--- a/youtube_dl/extractor/prosiebensat1.py
+++ b/youtube_dl/extractor/prosiebensat1.py
@@ -424,3 +424,6 @@ class ProSiebenSat1IE(ProSiebenSat1BaseIE):
             return self._extract_clip(url, webpage)
         elif page_type == 'playlist':
             return self._extract_playlist(url, webpage)
+        else:
+            raise ExtractorError(
+                'Unsupported page type %s' % page_type, expected=True)