diff --git a/libavformat/mxfenc.c b/libavformat/mxfenc.c
index 8d962a308a..50fe235100 100644
--- a/libavformat/mxfenc.c
+++ b/libavformat/mxfenc.c
@@ -195,7 +195,7 @@ static const uint8_t umid_base[]            = { 0x06,0x0A,0x2B,0x34,0x01,0x01,0x
 /**
  * complete key for operation pattern, partitions, and primer pack
  */
-static const uint8_t op1a_ul[]                     = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x01,0x01,0x00 };
+static const uint8_t op1a_ul[]                     = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x01,0x09,0x00 };
 static const uint8_t footer_partition_key[]        = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }; // ClosedComplete
 static const uint8_t primer_pack_key[]             = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x02,0x01,0x01,0x05,0x01,0x00 };
 static const uint8_t index_table_segment_key[]     = { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 };
@@ -465,12 +465,7 @@ static void mxf_write_preface(AVFormatContext *s)
 
     // operational pattern
     mxf_write_local_tag(pb, 16, 0x3B09);
-    if (s->nb_streams > 1) {
-        put_buffer(pb, op1a_ul, 14);
-        put_be16(pb, 0x0900); // multi track
-    } else {
-        put_buffer(pb, op1a_ul, 16);
-    }
+    put_buffer(pb, op1a_ul, 16);
 
     // write essence_container_refs
     mxf_write_local_tag(pb, 8 + 16 * mxf->essence_container_count, 0x3B0A);
@@ -1234,12 +1229,7 @@ static void mxf_write_partition(AVFormatContext *s, int bodysid,
     put_be32(pb, bodysid); // bodySID
 
     // operational pattern
-    if (s->nb_streams > 1) {
-        put_buffer(pb, op1a_ul, 14);
-        put_be16(pb, 0x0900); // multi track
-    } else {
-        put_buffer(pb, op1a_ul, 16);
-    }
+    put_buffer(pb, op1a_ul, 16);
 
     // essence container
     mxf_write_essence_container_refs(s);