diff --git a/app/proxyman/mux/mux_test.go b/app/proxyman/mux/mux_test.go
index c8508dc26..0bbd1202b 100644
--- a/app/proxyman/mux/mux_test.go
+++ b/app/proxyman/mux/mux_test.go
@@ -30,7 +30,7 @@ func readAll(reader buf.Reader) (buf.MultiBuffer, error) {
 func TestReaderWriter(t *testing.T) {
 	assert := With(t)
 
-	pReader, pWriter := pipe.New()
+	pReader, pWriter := pipe.New(pipe.WithSizeLimit(1024))
 
 	dest := net.TCPDestination(net.DomainAddress("v2ray.com"), 80)
 	writer := NewWriter(1, dest, pWriter, protocol.TransferTypeStream)
diff --git a/common/buf/reader_test.go b/common/buf/reader_test.go
index f5ea1e104..347985b56 100644
--- a/common/buf/reader_test.go
+++ b/common/buf/reader_test.go
@@ -38,7 +38,7 @@ func TestAdaptiveReader(t *testing.T) {
 func TestBytesReaderWriteTo(t *testing.T) {
 	assert := With(t)
 
-	pReader, pWriter := pipe.New()
+	pReader, pWriter := pipe.New(pipe.WithSizeLimit(1024))
 	reader := &BufferedReader{Reader: pReader}
 	b1 := New()
 	b1.AppendBytes('a', 'b', 'c')
@@ -47,7 +47,7 @@ func TestBytesReaderWriteTo(t *testing.T) {
 	assert(pWriter.WriteMultiBuffer(NewMultiBufferValue(b1, b2)), IsNil)
 	pWriter.Close()
 
-	pReader2, pWriter2 := pipe.New()
+	pReader2, pWriter2 := pipe.New(pipe.WithSizeLimit(1024))
 	writer := NewBufferedWriter(pWriter2)
 	writer.SetBuffered(false)
 
@@ -65,7 +65,7 @@ func TestBytesReaderWriteTo(t *testing.T) {
 func TestBytesReaderMultiBuffer(t *testing.T) {
 	assert := With(t)
 
-	pReader, pWriter := pipe.New()
+	pReader, pWriter := pipe.New(pipe.WithSizeLimit(1024))
 	reader := &BufferedReader{Reader: pReader}
 	b1 := New()
 	b1.AppendBytes('a', 'b', 'c')
diff --git a/common/buf/writer_test.go b/common/buf/writer_test.go
index dbd324abc..09b01559f 100644
--- a/common/buf/writer_test.go
+++ b/common/buf/writer_test.go
@@ -34,8 +34,8 @@ func TestWriter(t *testing.T) {
 func TestBytesWriterReadFrom(t *testing.T) {
 	assert := With(t)
 
-	pReader, pWriter := pipe.New()
 	const size = 50000
+	pReader, pWriter := pipe.New(pipe.WithSizeLimit(size))
 	reader := bufio.NewReader(io.LimitReader(rand.Reader, size))
 	writer := NewBufferedWriter(pWriter)
 	writer.SetBuffered(false)
diff --git a/transport/internet/udp/dispatcher_test.go b/transport/internet/udp/dispatcher_test.go
index 4d3323429..f7a93bd09 100644
--- a/transport/internet/udp/dispatcher_test.go
+++ b/transport/internet/udp/dispatcher_test.go
@@ -34,8 +34,8 @@ func TestSameDestinationDispatching(t *testing.T) {
 	assert := With(t)
 
 	ctx, cancel := context.WithCancel(context.Background())
-	uplinkReader, uplinkWriter := pipe.New()
-	downlinkReader, downlinkWriter := pipe.New()
+	uplinkReader, uplinkWriter := pipe.New(pipe.WithSizeLimit(1024))
+	downlinkReader, downlinkWriter := pipe.New(pipe.WithSizeLimit(1024))
 
 	go func() {
 		for {
diff --git a/transport/pipe/pipe_test.go b/transport/pipe/pipe_test.go
index 10063ba1e..5a823c779 100644
--- a/transport/pipe/pipe_test.go
+++ b/transport/pipe/pipe_test.go
@@ -15,7 +15,7 @@ import (
 func TestPipeReadWrite(t *testing.T) {
 	assert := With(t)
 
-	pReader, pWriter := New()
+	pReader, pWriter := New(WithSizeLimit(1024))
 	payload := []byte{'a', 'b', 'c', 'd'}
 	b := buf.New()
 	b.Write(payload)
@@ -29,7 +29,7 @@ func TestPipeReadWrite(t *testing.T) {
 func TestPipeCloseError(t *testing.T) {
 	assert := With(t)
 
-	pReader, pWriter := New()
+	pReader, pWriter := New(WithSizeLimit(1024))
 	payload := []byte{'a', 'b', 'c', 'd'}
 	b := buf.New()
 	b.Write(payload)
@@ -44,7 +44,7 @@ func TestPipeCloseError(t *testing.T) {
 func TestPipeClose(t *testing.T) {
 	assert := With(t)
 
-	pReader, pWriter := New()
+	pReader, pWriter := New(WithSizeLimit(1024))
 	payload := []byte{'a', 'b', 'c', 'd'}
 	b := buf.New()
 	b.Write(payload)