diff --git a/internal/ethapi/transaction_args.go b/internal/ethapi/transaction_args.go
index 52811b2a9..2d08d3008 100644
--- a/internal/ethapi/transaction_args.go
+++ b/internal/ethapi/transaction_args.go
@@ -146,6 +146,7 @@ func (args *TransactionArgs) setDefaults(ctx context.Context, b Backend) error {
 	if args.Gas == nil {
 		// These fields are immutable during the estimation, safe to
 		// pass the pointer directly.
+		data := args.data()
 		callArgs := TransactionArgs{
 			From:                 args.From,
 			To:                   args.To,
@@ -153,7 +154,7 @@ func (args *TransactionArgs) setDefaults(ctx context.Context, b Backend) error {
 			MaxFeePerGas:         args.MaxFeePerGas,
 			MaxPriorityFeePerGas: args.MaxPriorityFeePerGas,
 			Value:                args.Value,
-			Data:                 args.Data,
+			Data:                 (*hexutil.Bytes)(&data),
 			AccessList:           args.AccessList,
 		}
 		pendingBlockNr := rpc.BlockNumberOrHashWithNumber(rpc.PendingBlockNumber)