diff --git a/stream/mts/encoder.go b/stream/mts/encoder.go
index 0e52cb70..7bda82c7 100644
--- a/stream/mts/encoder.go
+++ b/stream/mts/encoder.go
@@ -216,7 +216,7 @@ func (e *Encoder) writePSI() error {
 	if err != nil {
 		return err
 	}
-	err = updateMeta(&pmtTable)
+	pmtTable, err = updateMeta(pmtTable)
 	if err != nil {
 		return err
 	}
@@ -262,9 +262,8 @@ func (e *Encoder) ccFor(pid int) byte {
 
 // updateMeta adds/updates a metaData descriptor in the given psi bytes using data
 // contained in the global Meta struct.
-func updateMeta(b *[]byte) error {
-	p := psi.PSIBytes(*b)
+func updateMeta(b []byte) ([]byte, error) {
+	p := psi.PSIBytes(b)
 	err := p.AddDescriptor(psi.MetadataTag, Meta.Encode())
-	*b = []byte(p)
-	return err
+	return []byte(p), err
 }