diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index 78ccc2639c..058acd5263 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -397,6 +397,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
 
                 ast = s->streams[0]->priv_data;
                 av_freep(&s->streams[0]->codec->extradata);
+                av_freep(&s->streams[0]->codec);
                 av_freep(&s->streams[0]);
                 s->nb_streams = 0;
                 if (CONFIG_DV_DEMUXER) {