diff --git a/container/mts/audio_test.go b/container/mts/audio_test.go
index 9ef1f883..f785930d 100644
--- a/container/mts/audio_test.go
+++ b/container/mts/audio_test.go
@@ -50,7 +50,7 @@ func TestEncodePcm(t *testing.T) {
 	sampleSize := 2
 	blockSize := 16000
 	writeFreq := float64(sampleRate*sampleSize) / float64(blockSize)
-	e := NewEncoder(&nopCloser{&buf}, writeFreq, Audio)
+	e := NewEncoder(nopCloser{&buf}, writeFreq, Audio)
 
 	inPath := "../../../test/test-data/av/input/sweep_400Hz_20000Hz_-3dBFS_5s_48khz.pcm"
 	inPcm, err := ioutil.ReadFile(inPath)
diff --git a/container/mts/metaEncode_test.go b/container/mts/metaEncode_test.go
index 7fc23252..939de5b7 100644
--- a/container/mts/metaEncode_test.go
+++ b/container/mts/metaEncode_test.go
@@ -48,7 +48,7 @@ const fps = 25
 func TestMetaEncode1(t *testing.T) {
 	Meta = meta.New()
 	var buf bytes.Buffer
-	e := NewEncoder(&nopCloser{&buf}, fps, Video)
+	e := NewEncoder(nopCloser{&buf}, fps, Video)
 	Meta.Add("ts", "12345678")
 	if err := e.writePSI(); err != nil {
 		t.Errorf(errUnexpectedErr, err.Error())
@@ -76,7 +76,7 @@ func TestMetaEncode1(t *testing.T) {
 func TestMetaEncode2(t *testing.T) {
 	Meta = meta.New()
 	var buf bytes.Buffer
-	e := NewEncoder(&nopCloser{&buf}, fps, Video)
+	e := NewEncoder(nopCloser{&buf}, fps, Video)
 	Meta.Add("ts", "12345678")
 	Meta.Add("loc", "1234,4321,1234")
 	if err := e.writePSI(); err != nil {