diff --git a/youtube_dl/extractor/extractors.py b/youtube_dl/extractor/extractors.py
index e1b6927e8..b1ed8a4b2 100644
--- a/youtube_dl/extractor/extractors.py
+++ b/youtube_dl/extractor/extractors.py
@@ -1522,6 +1522,6 @@ from .zattoo import (
     ZattooIE,
     ZattooLiveIE,
 )
-from .zdf3sat import ZDFIE, ZDFChannelIE
+from .zdf import ZDFIE, ZDFChannelIE
 from .zingmp3 import ZingMp3IE
 from .zype import ZypeIE
diff --git a/youtube_dl/extractor/zdf3sat.py b/youtube_dl/extractor/zdf.py
similarity index 98%
rename from youtube_dl/extractor/zdf3sat.py
rename to youtube_dl/extractor/zdf.py
index 6c22d24c4..afa3f6c47 100644
--- a/youtube_dl/extractor/zdf3sat.py
+++ b/youtube_dl/extractor/zdf.py
@@ -39,7 +39,7 @@ class ZDFBaseIE(InfoExtractor):
 
 
 class ZDFIE(ZDFBaseIE):
-    _VALID_URL = r'https?://www\.(?:zdf|3sat)\.de/(?:[^/]+/)*(?P<id>[^/?]+)\.html'
+    _VALID_URL = r'https?://www\.zdf\.de/(?:[^/]+/)*(?P<id>[^/?]+)\.html'
     _QUALITIES = ('auto', 'low', 'med', 'high', 'veryhigh')
 
     _TESTS = [{
@@ -53,9 +53,6 @@ class ZDFIE(ZDFBaseIE):
             'timestamp': 1465021200,
             'upload_date': '20160604',
         },
-    }, {
-        'url': 'https://www.3sat.de/kultur/kulturdoku/der-gugelhupf-koenig-der-kuchen-100.html',
-        'only_matching': True,
     }, {
         'url': 'https://www.zdf.de/service-und-hilfe/die-neue-zdf-mediathek/zdfmediathek-trailer-100.html',
         'only_matching': True,