diff --git a/yt_dlp/extractor/twitcasting.py b/yt_dlp/extractor/twitcasting.py
index 5eb3926d64..8c2235a8ec 100644
--- a/yt_dlp/extractor/twitcasting.py
+++ b/yt_dlp/extractor/twitcasting.py
@@ -85,7 +85,7 @@ def _real_extract(self, url):
         if video_password:
             request_data = urlencode_postdata({
                 'password': video_password,
-            })
+            }, encoding='utf-8')
         webpage = self._download_webpage(
             url, video_id, data=request_data,
             headers={'Origin': 'https://twitcasting.tv'})