diff --git a/src/crypto/elliptic/elliptic.go b/src/crypto/elliptic/elliptic.go
index f3b84e1eac..e6b59c5f43 100644
--- a/src/crypto/elliptic/elliptic.go
+++ b/src/crypto/elliptic/elliptic.go
@@ -320,7 +320,7 @@ func Unmarshal(curve Curve, data []byte) (x, y *big.Int) {
 	}
 	x = new(big.Int).SetBytes(data[1 : 1+byteLen])
 	y = new(big.Int).SetBytes(data[1+byteLen:])
-	if !curve.Params().IsOnCurve(x, y) {
+	if !curve.IsOnCurve(x, y) {
 		x, y = nil, nil
 	}
 	return