diff --git a/crypto/crypto.go b/crypto/crypto.go
index 7f7171f730..aaa5cc43a2 100644
--- a/crypto/crypto.go
+++ b/crypto/crypto.go
@@ -45,7 +45,7 @@ const RecoveryIDOffset = 64
 const DigestLength = 32
 
 var (
-	secp256k1N, _  = new(big.Int).SetString("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141", 16)
+	secp256k1N     = S256().Params().N
 	secp256k1halfN = new(big.Int).Div(secp256k1N, big.NewInt(2))
 )