diff --git a/gallery_dl/downloader/ytdl.py b/gallery_dl/downloader/ytdl.py
index 9d653b3b..7a20dc2c 100644
--- a/gallery_dl/downloader/ytdl.py
+++ b/gallery_dl/downloader/ytdl.py
@@ -200,6 +200,7 @@ class YoutubeDLDownloader(DownloaderBase):
             return None
 
         info_dict = {
+            "extractor": "",
             "id"       : video_id,
             "title"    : video_id,
             "formats"  : fmts,