diff --git a/libmpdemux/demux_audio.c b/libmpdemux/demux_audio.c
index 57fa0d340c..a1371aa5f1 100644
--- a/libmpdemux/demux_audio.c
+++ b/libmpdemux/demux_audio.c
@@ -392,7 +392,6 @@ static int demux_audio_open(demuxer_t* demuxer) {
     l -= 16;
     if (l >= 2) {
       w->cbSize = stream_read_word_le(s);
-      if (w->cbSize < 0) w->cbSize = 0;
       l -= 2;
       if (l < w->cbSize) {
         mp_msg(MSGT_DEMUX,MSGL_ERR,"[demux_audio] truncated extradata (%d < %d)\n",