diff --git a/libavformat/mxfenc.c b/libavformat/mxfenc.c
index cf3472d43a..e626435f70 100644
--- a/libavformat/mxfenc.c
+++ b/libavformat/mxfenc.c
@@ -173,6 +173,7 @@ static const MXFLocalTagPair mxf_local_tag_batch[] = {
     { 0x320E, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x01,0x04,0x01,0x01,0x01,0x01,0x00,0x00,0x00}}, /* Aspect Ratio */
     { 0x3201, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x02,0x04,0x01,0x06,0x01,0x00,0x00,0x00,0x00}}, /* Picture Essence Coding */
     // Generic Sound Essence Descriptor
+    { 0x3D02, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x01,0x04,0x00,0x00,0x00}}, /* Locked/Unlocked */
     { 0x3D03, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x03,0x01,0x01,0x01,0x00,0x00}}, /* Audio sampling rate */
     { 0x3D07, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x05,0x04,0x02,0x01,0x01,0x04,0x00,0x00,0x00}}, /* ChannelCount */
     { 0x3D01, {0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0x04,0x04,0x02,0x03,0x03,0x04,0x00,0x00,0x00}}, /* Quantization bits */
@@ -607,7 +608,10 @@ static void mxf_write_wav_desc(AVFormatContext *s, AVStream *st)
 {
     ByteIOContext *pb = s->pb;
 
-    mxf_write_generic_desc(pb, st, mxf_wav_descriptor_key, 88);
+    mxf_write_generic_desc(pb, st, mxf_wav_descriptor_key, 93);
+
+    mxf_write_local_tag(pb, 1, 0x3D02);
+    put_byte(pb, 1);
 
     // write audio sampling rate
     mxf_write_local_tag(pb, 8, 0x3D03);