diff --git a/types/uint.go b/types/uint.go
index 4bb71fff0..a6c4a0abf 100644
--- a/types/uint.go
+++ b/types/uint.go
@@ -13,6 +13,11 @@ type Uint struct {
 	i *big.Int
 }
 
+// BigInt converts Uint to big.Int
+func (u Uint) BigInt() *big.Int {
+	return new(big.Int).Set(u.i)
+}
+
 // NewUintFromBigUint constructs Uint from big.Uint
 func NewUintFromBigInt(i *big.Int) Uint {
 	u, err := checkNewUint(i)
diff --git a/types/uint_test.go b/types/uint_test.go
index 167f65284..34fc1780b 100644
--- a/types/uint_test.go
+++ b/types/uint_test.go
@@ -84,6 +84,7 @@ func TestIdentUint(t *testing.T) {
 
 		cases := []uint64{
 			i.Uint64(),
+			i.BigInt().Uint64(),
 			i.i.Uint64(),
 			ifromstr.Uint64(),
 			NewUintFromBigInt(new(big.Int).SetUint64(n)).Uint64(),