diff --git a/core/types/bundle.go b/core/types/bundle.go
index 203c7c1f05..c691ab2a1b 100644
--- a/core/types/bundle.go
+++ b/core/types/bundle.go
@@ -7,13 +7,12 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/rlp"
-	"github.com/ethereum/go-ethereum/rpc"
 )
 
 // SendBundleArgs represents the arguments for a call.
 type SendBundleArgs struct {
 	Txs               []hexutil.Bytes `json:"txs"`
-	MaxBlockNumber    rpc.BlockNumber `json:"maxBlockNumber"`
+	MaxBlockNumber    uint64          `json:"maxBlockNumber"`
 	MinTimestamp      *uint64         `json:"minTimestamp"`
 	MaxTimestamp      *uint64         `json:"maxTimestamp"`
 	RevertingTxHashes []common.Hash   `json:"revertingTxHashes"`
diff --git a/internal/ethapi/api_bundle.go b/internal/ethapi/api_bundle.go
index 7bb28a2639..441345f9b6 100644
--- a/internal/ethapi/api_bundle.go
+++ b/internal/ethapi/api_bundle.go
@@ -47,7 +47,7 @@ func (s *PrivateTxBundleAPI) SendBundle(ctx context.Context, args *types.SendBun
 		args.MaxTimestamp = &maxTimeStamp
 	}
 
-	if args.MaxBlockNumber != 0 && args.MaxBlockNumber.Int64() > currentHeader.Number.Int64()+MaxBundleAliveBlock {
+	if args.MaxBlockNumber != 0 && args.MaxBlockNumber > currentHeader.Number.Uint64()+MaxBundleAliveBlock {
 		return newBundleError(errors.New("the maxBlockNumber should not be lager than currentBlockNum + 100"))
 	}
 
@@ -88,7 +88,7 @@ func (s *PrivateTxBundleAPI) SendBundle(ctx context.Context, args *types.SendBun
 
 	bundle := &types.Bundle{
 		Txs:               txs,
-		MaxBlockNumber:    uint64(args.MaxBlockNumber),
+		MaxBlockNumber:    args.MaxBlockNumber,
 		MinTimestamp:      minTimestamp,
 		MaxTimestamp:      maxTimestamp,
 		RevertingTxHashes: args.RevertingTxHashes,