diff --git a/mockid/api/common.go b/mockid/api/common.go
index 8d6b82e..b2fca1e 100644
--- a/mockid/api/common.go
+++ b/mockid/api/common.go
@@ -41,13 +41,18 @@ func getOpts(r *http.Request) (*options, error) {
 		seed, _ = binary.ReadVarint(bytes.NewReader(b[0:8]))
 	}
 
+	var n int
 	if 0 != seed {
-		rndReader = rand.New(rand.NewSource(seed))
+		rnd := rand.New(rand.NewSource(seed))
+		rndReader = rnd
+		n = rnd.Intn(2)
+	} else {
+		n = rand.Intn(2)
 	}
 
 	kty, _ := tok["kty"].(string)
 	if "" == kty {
-		if 0 == rand.Intn(2) {
+		if 0 == n {
 			kty = "RSA"
 		} else {
 			kty = "EC"
diff --git a/mockid/mockid_test.go b/mockid/mockid_test.go
index 9e45588..db6dc69 100644
--- a/mockid/mockid_test.go
+++ b/mockid/mockid_test.go
@@ -121,7 +121,7 @@ func TestGenWithSeed(t *testing.T) {
 	res, err := client.Do(&http.Request{
 		Method: "POST",
 		URL:    urlstr,
-		Body:   ioutil.NopCloser(bytes.NewReader([]byte(`{"seed":"test"}`))),
+		Body:   ioutil.NopCloser(bytes.NewReader([]byte(`{"seed":"c"}`))),
 	})
 	if nil != err {
 		//t.Fatal(err)
@@ -141,7 +141,7 @@ func TestGenWithSeed(t *testing.T) {
 	res, err = client.Do(&http.Request{
 		Method: "POST",
 		URL:    urlstr,
-		Body:   ioutil.NopCloser(bytes.NewReader([]byte(`{"seed":"test"}`))),
+		Body:   ioutil.NopCloser(bytes.NewReader([]byte(`{"seed":"c"}`))),
 	})
 	if nil != err {
 		//t.Fatal(err)