diff --git a/youtube_dl/extractor/dreisat.py b/youtube_dl/extractor/dreisat.py
index f141c850d6..416e25156e 100644
--- a/youtube_dl/extractor/dreisat.py
+++ b/youtube_dl/extractor/dreisat.py
@@ -4,7 +4,6 @@ import re
 
 from .common import InfoExtractor
 from ..utils import (
-    determine_ext,
     unified_strdate,
 )
 
diff --git a/youtube_dl/extractor/mit.py b/youtube_dl/extractor/mit.py
index ab8b7ec3ea..76b717fe5d 100644
--- a/youtube_dl/extractor/mit.py
+++ b/youtube_dl/extractor/mit.py
@@ -3,7 +3,6 @@ import json
 
 from .common import InfoExtractor
 from ..utils import (
-    compat_str,
     clean_html,
     get_element_by_id,
 )