diff --git a/youtube_dl/extractor/promptfile.py b/youtube_dl/extractor/promptfile.py
index 9ef49b19a..463e85501 100644
--- a/youtube_dl/extractor/promptfile.py
+++ b/youtube_dl/extractor/promptfile.py
@@ -56,8 +56,8 @@ def _real_extract(self, url):
             'format_id': 'sd',
             'url': url,
             'ext': determine_ext(title),
-            'quality': 1,
         }]
+        self._sort_formats(formats)
 
         return {
             'id': video_id,