diff --git a/core/chains/evm/client/compatibility_helper.go b/core/chains/evm/client/compatibility_helper.go
index fa5eb1a50e..c0384e7742 100644
--- a/core/chains/evm/client/compatibility_helper.go
+++ b/core/chains/evm/client/compatibility_helper.go
@@ -35,8 +35,8 @@ func ToBackwardCompatibleCallArg(msg ethereum.CallMsg) interface{} {
 		"to":   msg.To,
 	}
 	if len(msg.Data) > 0 {
-		// arg["input"] = hexutil.Bytes(msg.Data)
-		arg["data"] = hexutil.Bytes(msg.Data) // duplicate legacy field for compatibility
+		arg["input"] = hexutil.Bytes(msg.Data)
+		// arg["data"] = hexutil.Bytes(msg.Data) // duplicate legacy field for compatibility
 	}
 	if msg.Value != nil {
 		arg["value"] = (*hexutil.Big)(msg.Value)
diff --git a/gencodec b/gencodec
new file mode 100755
index 0000000000..e415ccd9ec
Binary files /dev/null and b/gencodec differ