diff --git a/proxy/mtproto/auth_test.go b/proxy/mtproto/auth_test.go
index e2778d0c..6f392fe1 100644
--- a/proxy/mtproto/auth_test.go
+++ b/proxy/mtproto/auth_test.go
@@ -6,21 +6,27 @@ import (
 	"testing"
 
 	"v2ray.com/core/common"
+	"v2ray.com/core/common/compare"
 	. "v2ray.com/core/proxy/mtproto"
 	. "v2ray.com/ext/assert"
 )
 
 func TestInverse(t *testing.T) {
-	assert := With(t)
-
+	const size = 64
 	b := make([]byte, 64)
-	common.Must2(rand.Read(b))
+	for b[0] == b[size-1] {
+		common.Must2(rand.Read(b))
+	}
 
 	bi := Inverse(b)
-	assert(b[0], NotEquals, bi[0])
+	if b[0] == bi[0] {
+		t.Fatal("seems bytes are not inversed: ", b[0], "vs", bi[0])
+	}
 
 	bii := Inverse(bi)
-	assert(bii, Equals, b)
+	if err := compare.BytesEqualWithDetail(bii, b); err != nil {
+		t.Fatal(err)
+	}
 }
 
 func TestAuthenticationReadWrite(t *testing.T) {