diff --git a/libavformat/mmf.c b/libavformat/mmf.c
index d1e6f81e98..6240e49bee 100644
--- a/libavformat/mmf.c
+++ b/libavformat/mmf.c
@@ -76,8 +76,8 @@ static int mmf_write_header(AVFormatContext *s)
     avio_wb32(pb, 0);
     pos = ff_start_tag(pb, "CNTI");
     avio_w8(pb, 0); /* class */
-    avio_w8(pb, 0); /* type */
-    avio_w8(pb, 0); /* code type */
+    avio_w8(pb, 1); /* type */
+    avio_w8(pb, 1); /* code type */
     avio_w8(pb, 0); /* status */
     avio_w8(pb, 0); /* counts */
     avio_write(pb, "VN:libavcodec,", sizeof("VN:libavcodec,") -1); /* metadata ("ST:songtitle,VN:version,...") */
diff --git a/tests/ref/lavf/mmf b/tests/ref/lavf/mmf
index 756527c82a..89097842a0 100644
--- a/tests/ref/lavf/mmf
+++ b/tests/ref/lavf/mmf
@@ -1,3 +1,3 @@
-272b91d8fc31ed43b08246d182719751 *./tests/data/lavf/lavf.mmf
+1982e25aaa5307068c5e0f0fd54b193a *./tests/data/lavf/lavf.mmf
 22609 ./tests/data/lavf/lavf.mmf
 ./tests/data/lavf/lavf.mmf CRC=0x03633476