diff --git a/crypto/kzg4844/kzg4844.go b/crypto/kzg4844/kzg4844.go
index 0a2478cea0..fd2e2991fe 100644
--- a/crypto/kzg4844/kzg4844.go
+++ b/crypto/kzg4844/kzg4844.go
@@ -45,7 +45,7 @@ func (b *Blob) UnmarshalJSON(input []byte) error {
 }
 
 // MarshalText returns the hex representation of b.
-func (b Blob) MarshalText() ([]byte, error) {
+func (b *Blob) MarshalText() ([]byte, error) {
 	return hexutil.Bytes(b[:]).MarshalText()
 }