diff --git a/core/types/gen_return_data.go b/core/types/gen_return_data.go
new file mode 100644
index 0000000000..541328c6d8
--- /dev/null
+++ b/core/types/gen_return_data.go
@@ -0,0 +1,52 @@
+// Code generated by github.com/fjl/gencodec. DO NOT EDIT.
+
+package types
+
+import (
+	"encoding/json"
+	"errors"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+)
+
+var _ = (*returnDataMarshaling)(nil)
+
+// MarshalJSON marshals as JSON.
+func (r ReturnData) MarshalJSON() ([]byte, error) {
+	type ReturnData struct {
+		TxHash  common.Hash   `json:"transactionHash" gencodec:"required"`
+		Data    hexutil.Bytes `json:"returndata" gencodec:"required"`
+		Removed bool          `json:"removed"`
+	}
+	var enc ReturnData
+	enc.TxHash = r.TxHash
+	enc.Data = r.Data
+	enc.Removed = r.Removed
+	return json.Marshal(&enc)
+}
+
+// UnmarshalJSON unmarshals from JSON.
+func (r *ReturnData) UnmarshalJSON(input []byte) error {
+	type ReturnData struct {
+		TxHash  *common.Hash   `json:"transactionHash" gencodec:"required"`
+		Data    *hexutil.Bytes `json:"returndata" gencodec:"required"`
+		Removed *bool          `json:"removed"`
+	}
+	var dec ReturnData
+	if err := json.Unmarshal(input, &dec); err != nil {
+		return err
+	}
+	if dec.TxHash == nil {
+		return errors.New("missing required field 'transactionHash' for ReturnData")
+	}
+	r.TxHash = *dec.TxHash
+	if dec.Data == nil {
+		return errors.New("missing required field 'returndata' for ReturnData")
+	}
+	r.Data = *dec.Data
+	if dec.Removed != nil {
+		r.Removed = *dec.Removed
+	}
+	return nil
+}
diff --git a/core/types/transaction.go b/core/types/transaction.go
index 9fd8899319..ace9104141 100644
--- a/core/types/transaction.go
+++ b/core/types/transaction.go
@@ -30,6 +30,7 @@ import (
 )
 
 //go:generate gencodec -type txdata -field-override txdataMarshaling -out gen_tx_json.go
+//go:generate gencodec -type ReturnData -field-override returnDataMarshaling -out gen_return_data.go
 
 var (
 	ErrInvalidSig = errors.New("invalid transaction v, r, s values")
@@ -92,6 +93,10 @@ type ReturnData struct {
 	Removed bool `json:"removed"`
 }
 
+type returnDataMarshaling struct {
+	Data hexutil.Bytes
+}
+
 func NewTransaction(nonce uint64, to common.Address, amount *big.Int, gasLimit uint64, gasPrice *big.Int, data []byte) *Transaction {
 	return newTransaction(nonce, &to, amount, gasLimit, gasPrice, data)
 }