diff --git a/main.go b/main.go
index 7ebbc66..c783060 100644
--- a/main.go
+++ b/main.go
@@ -821,6 +821,7 @@ func writeM4a(w *mp4.Writer, info *SongInfo, meta *AutoGenerated, data []byte, t
 					if meta.Data[0].Relationships.Tracks.Data[trackTotal - 1].Attributes.DiscNumber > 1{
 						disk := make([]byte, 8)
 						binary.BigEndian.PutUint32(disk, uint32(meta.Data[0].Relationships.Tracks.Data[index].Attributes.DiscNumber))
+						binary.BigEndian.PutUint16(disk[4:], uint16(meta.Data[0].Relationships.Tracks.Data[trackTotal - 1].Attributes.DiscNumber))
 						err = addMeta(mp4.BoxType{'d', 'i', 's', 'k'}, disk)
 						if err != nil {
 							return err