diff --git a/libavformat/wtvdec.c b/libavformat/wtvdec.c
index bf27f291e7..597a11fbd4 100644
--- a/libavformat/wtvdec.c
+++ b/libavformat/wtvdec.c
@@ -562,7 +562,7 @@ static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
     AVIOContext *pb = wtv->pb;
 
     avio_skip(pb, 72);  // picture aspect ratio is unreliable
-    ff_get_bmp_header(pb, st, NULL);
+    st->codec->codec_tag = ff_get_bmp_header(pb, st, NULL);
 
     return 72 + 40;
 }