diff --git a/libavformat/mp3.c b/libavformat/mp3.c
index 35e1d86887cdf78208f32869de871ea37c4b0124..0da8a400e9535a29510485e8d4ff042aa9fd2907 100644
--- a/libavformat/mp3.c
+++ b/libavformat/mp3.c
@@ -253,7 +253,8 @@ static int mp3_read_header(AVFormatContext *s,
 
     st->codec.codec_type = CODEC_TYPE_AUDIO;
     st->codec.codec_id = CODEC_ID_MP3;
-
+    st->need_parsing = 1;
+    
     /* try to get the TAG */
     if (!url_is_streamed(&s->pb)) {
         /* XXX: change that */