diff --git a/util/util.go b/util/util.go
index b4219c5..a75a4b7 100644
--- a/util/util.go
+++ b/util/util.go
@@ -8,6 +8,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/math"
+	"github.com/ethereum/go-ethereum/common/hexutil"
 )
 
 var Ether = math.BigPow(10, 18)
@@ -35,7 +36,7 @@ func MakeTimestamp() int64 {
 func GetTargetHex(diff int64) string {
 	difficulty := big.NewInt(diff)
 	diff1 := new(big.Int).Div(pow256, difficulty)
-	return string(common.ToHex(diff1.Bytes()))
+	return string(hexutil.Encode(diff1.Bytes()))
 }
 
 func TargetHexToDiff(targetHex string) *big.Int {