diff --git a/crypto/crypto.go b/crypto/crypto.go
index 53e0b2da4e..4641b2d586 100644
--- a/crypto/crypto.go
+++ b/crypto/crypto.go
@@ -30,6 +30,7 @@ import (
 	"github.com/expanse-org/go-expanse/common"
 	"github.com/expanse-org/go-expanse/crypto/sha3"
 	"github.com/expanse-org/go-expanse/rlp"
+)
 
 var (
 	secp256k1_N, _  = new(big.Int).SetString("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141", 16)