diff --git a/proxy/vmess/encoding/auth_test.go b/proxy/vmess/encoding/auth_test.go
index a2eafdba5..a160fdea9 100644
--- a/proxy/vmess/encoding/auth_test.go
+++ b/proxy/vmess/encoding/auth_test.go
@@ -4,6 +4,7 @@ import (
 	"crypto/rand"
 	"testing"
 
+	"v2ray.com/core/common"
 	. "v2ray.com/core/proxy/vmess/encoding"
 	"v2ray.com/core/testing/assert"
 )
@@ -13,11 +14,12 @@ func TestFnvAuth(t *testing.T) {
 	fnvAuth := new(FnvAuthenticator)
 
 	expectedText := make([]byte, 256)
-	rand.Read(expectedText)
+	_, err := rand.Read(expectedText)
+	common.Must(err)
 
 	buffer := make([]byte, 512)
 	b := fnvAuth.Seal(buffer[:0], nil, expectedText, nil)
-	b, err := fnvAuth.Open(buffer[:0], nil, b, nil)
+	b, err = fnvAuth.Open(buffer[:0], nil, b, nil)
 	assert.Error(err).IsNil()
 	assert.Int(len(b)).Equals(256)
 	assert.Bytes(b).Equals(expectedText)