diff --git a/core/types/block.go b/core/types/block.go
index aee7f8752a..eacd96902b 100644
--- a/core/types/block.go
+++ b/core/types/block.go
@@ -21,7 +21,6 @@ import (
 	"crypto/sha256"
 	"encoding/binary"
 	"fmt"
-	"github.com/ethereum/go-ethereum/core/types/bal"
 	"io"
 	"math/big"
 	"reflect"
@@ -29,6 +28,8 @@ import (
 	"sync/atomic"
 	"time"
 
+	"github.com/ethereum/go-ethereum/core/types/bal"
+
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/rlp"