diff --git a/sm2/sm2.go b/sm2/sm2.go
index 82c148c..cf3df1e 100644
--- a/sm2/sm2.go
+++ b/sm2/sm2.go
@@ -377,6 +377,7 @@ func NewPublicKey(key []byte) (*ecdsa.PublicKey, error) {
 		return nil, err
 	}
 	k := new(ecdsa.PublicKey)
+	k.Curve = c.curve
 	k.X, k.Y, err = c.pointToAffine(p)
 	if err != nil {
 		return nil, err
diff --git a/smx509/equal_test.go b/smx509/equal_test.go
index 70d4319..a27c5eb 100644
--- a/smx509/equal_test.go
+++ b/smx509/equal_test.go
@@ -19,7 +19,7 @@ func TestEqual(t *testing.T) {
 		t.Errorf("private.Public() is not Equal to public: %q", public)
 	}
 	if !private.Equal(private) {
-		t.Errorf("private key is not equal to itself: %q", private)
+		t.Errorf("private key is not equal to itself")
 	}
 
 	enc, err := MarshalPKCS8PrivateKey(private)