diff --git a/youtube_dl/extractor/bilibili.py b/youtube_dl/extractor/bilibili.py
index bd379cc20..68f95be7f 100644
--- a/youtube_dl/extractor/bilibili.py
+++ b/youtube_dl/extractor/bilibili.py
@@ -11,10 +11,7 @@ from ..compat import (
 from ..utils import (
     ExtractorError,
     int_or_none,
-    parse_iso8601,
-    smuggle_url,
     str_or_none,
-    strip_jsonp,
     unsmuggle_url,
 )