diff --git a/libavformat/nut.c b/libavformat/nut.c
index 645ca5986c..3a83d4f6b3 100644
--- a/libavformat/nut.c
+++ b/libavformat/nut.c
@@ -980,6 +980,7 @@ static int decode_stream_header(NUTContext *nut){
     nom = get_v(bc);
     denom = get_v(bc);
     nut->stream[stream_id].msb_timestamp_shift = get_v(bc);
+    st->codec.has_b_frames=
     nut->stream[stream_id].decode_delay= get_v(bc);
     get_byte(bc); /* flags */