diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index d7c0f7c0ac..2a6ef97be8 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -184,6 +184,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
 
                 st = s->streams[stream_index];
                 ast = st->priv_data;
+                st->codec.stream_codec_tag= handler;
                 
                 get_le32(pb); /* flags */
                 get_le16(pb); /* priority */