diff --git a/stream/mts/psi/psi.go b/stream/mts/psi/psi.go
index 8832dfb4..9d0c1906 100644
--- a/stream/mts/psi/psi.go
+++ b/stream/mts/psi/psi.go
@@ -321,15 +321,6 @@ func (p *PSIBytes) SetProgInfoLen(l int) {
 	(*p)[ProgramInfoLenIdx2] = byte(l)
 }
 
-func (p *PSIBytes) deleteDescriptor(tag int) error {
-	if i, desc := p.HasDescriptor(tag); desc != nil {
-		descLen := len(desc)
-		newProgInfoLen := p.ProgramInfoLen() - descLen
-		p.SetProgInfoLen(newProgInfoLen)
-	}
-	return errors.New("Descriptor doesn't exist")
-}
-
 func (d *Descriptor) update(data []byte) {
 	if len(data) > int((*d)[1]) {
 		// TODO: implement resizing of descriptor