diff --git a/youtube_dl/extractor/soundcloud.py b/youtube_dl/extractor/soundcloud.py
index 95788098ec..9d45059723 100644
--- a/youtube_dl/extractor/soundcloud.py
+++ b/youtube_dl/extractor/soundcloud.py
@@ -180,7 +180,7 @@ def _extract_info_dict(self, info, full_title=None, quiet=False, secret_token=No
                     'format_id': key,
                     'url': url,
                     'play_path': 'mp3:' + path,
-                    'ext': ext,
+                    'ext': 'flv',
                     'vcodec': 'none',
                 })