diff --git a/libavcodec/mpeg12enc.c b/libavcodec/mpeg12enc.c
index 5a7a612636..f7f19865cd 100644
--- a/libavcodec/mpeg12enc.c
+++ b/libavcodec/mpeg12enc.c
@@ -350,7 +350,7 @@ static void mpeg1_encode_sequence_header(MpegEncContext *s)
         put_bits(&s->pb, 1, 1);
         put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
         put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
-        put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
+        put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP) || s->intra_only);
         put_bits(&s->pb, 1, 0);                     // broken link
     }
 }
diff --git a/tests/ref/lavf/mxf_d10 b/tests/ref/lavf/mxf_d10
index 8e08bddd4a..98c2f6f535 100644
--- a/tests/ref/lavf/mxf_d10
+++ b/tests/ref/lavf/mxf_d10
@@ -1,3 +1,3 @@
-28cf73e6d35a8f7aba30c0ed2bd84924 *./tests/data/lavf/lavf.mxf_d10
+838b732d832dcf40b0eb9944bc6d8f55 *./tests/data/lavf/lavf.mxf_d10
 5330989 ./tests/data/lavf/lavf.mxf_d10
 ./tests/data/lavf/lavf.mxf_d10 CRC=0x6c74d488