diff --git a/gallery_dl/downloader/ytdl.py b/gallery_dl/downloader/ytdl.py
index e9b3294e..0631614b 100644
--- a/gallery_dl/downloader/ytdl.py
+++ b/gallery_dl/downloader/ytdl.py
@@ -41,6 +41,7 @@ class YoutubeDLDownloader(DownloaderBase):
         kwdict = pathfmt.kwdict
         tries = 0
 
+        kwdict["_mtime_http"] = None
         if ytdl_instance := kwdict.pop("_ytdl_instance", None):
             # 'ytdl' extractor
             self._prepare(ytdl_instance)