diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go
index b05c9a08d3797..b45c1f123f589 100644
--- a/internal/ethapi/api.go
+++ b/internal/ethapi/api.go
@@ -1284,6 +1284,11 @@ func newRPCTransaction(tx *types.Transaction, blockHash common.Hash, blockNumber
 		result.TransactionIndex = (*hexutil.Uint64)(&index)
 	}
 	switch tx.Type() {
+	case types.LegacyTxType:
+		// if a legacy transaction has an EIP-155 chain id, include it explicitly
+		if id := tx.ChainId(); id.Sign() == 0 {
+			result.ChainID = (*hexutil.Big)(id)
+		}
 	case types.AccessListTxType:
 		al := tx.AccessList()
 		result.Accesses = &al