diff --git a/core/types/tx_blob.go b/core/types/tx_blob.go
index 72d7cc38fa..caede7cc53 100644
--- a/core/types/tx_blob.go
+++ b/core/types/tx_blob.go
@@ -191,12 +191,6 @@ func (tx *BlobTx) withoutSidecar() *BlobTx {
 	return &cpy
 }
 
-func (tx *BlobTx) withSidecar(sidecar *BlobTxSidecar) *BlobTx {
-	cpy := *tx
-	cpy.Sidecar = sidecar
-	return &cpy
-}
-
 func (tx *BlobTx) encode(b *bytes.Buffer) error {
 	if tx.Sidecar == nil {
 		return rlp.Encode(b, tx)