diff --git a/youtube_dl/extractor/ted.py b/youtube_dl/extractor/ted.py
index c788feb5d..8aa27d282 100644
--- a/youtube_dl/extractor/ted.py
+++ b/youtube_dl/extractor/ted.py
@@ -210,6 +210,7 @@ class TEDIE(InfoExtractor):
                 'url': audio_download,
                 'format_id': 'audio',
                 'vcodec': 'none',
+                'preference': -0.5,
             })
 
         self._sort_formats(formats)