diff --git a/mobile/big.go b/mobile/big.go
index b69728b69efb..c08bcf93f285 100644
--- a/mobile/big.go
+++ b/mobile/big.go
@@ -38,7 +38,7 @@ func NewBigInt(x int64) *BigInt {
 // NewBigIntFromString allocates and returns a new BigInt set to x
 // interpreted in the provided base.
 func NewBigIntFromString(x string, base int) *BigInt {
-	b, success := big.NewInt(0).SetString(x, base)
+	b, success := new(big.Int).SetString(x, base)
 	if !success {
 		return nil
 	}