diff --git a/youtube_dl/downloader/hls.py b/youtube_dl/downloader/hls.py
index 60dca0ab1f..2b6c3370f5 100644
--- a/youtube_dl/downloader/hls.py
+++ b/youtube_dl/downloader/hls.py
@@ -32,6 +32,8 @@ def real_download(self, filename, info_dict):
             for opt in (ffpp.executable, '-y', '-i', url, '-f', 'mp4', '-c', 'copy', '-bsf:a', 'aac_adtstoasc')]
         args.append(encodeFilename(tmpfilename, True))
 
+        self._debug_cmd(args)
+
         retval = subprocess.call(args)
         if retval == 0:
             fsize = os.path.getsize(encodeFilename(tmpfilename))