diff --git a/core/stack.go b/core/stack.go
index f5c623b..8f2b9f6 100644
--- a/core/stack.go
+++ b/core/stack.go
@@ -23,10 +23,6 @@ type Config struct {
 	// stack to set transport handlers.
 	TransportHandler adapter.TransportHandler
 
-	// PrintFunc is the function that will be called
-	// to print internal stack events.
-	PrintFunc func(string, ...any)
-
 	// Options are supplement options to apply settings
 	// for the internal stack.
 	Options []option.Option
@@ -34,10 +30,6 @@ type Config struct {
 
 // CreateStack creates *stack.Stack with given config.
 func CreateStack(cfg *Config) (*stack.Stack, error) {
-	if cfg.PrintFunc == nil {
-		cfg.PrintFunc = func(string, ...any) {}
-	}
-
 	opts := []option.Option{option.WithDefault()}
 	if len(opts) > 0 {
 		opts = append(opts, cfg.Options...)
@@ -64,8 +56,8 @@ func CreateStack(cfg *Config) (*stack.Stack, error) {
 		// before creating NIC, otherwise NIC would dispatch packets
 		// to stack and cause race condition.
 		// Initiate transport protocol (TCP/UDP) with given handler.
-		withTCPHandler(cfg.TransportHandler.HandleTCP, cfg.PrintFunc),
-		withUDPHandler(cfg.TransportHandler.HandleUDP, cfg.PrintFunc),
+		withTCPHandler(cfg.TransportHandler.HandleTCP),
+		withUDPHandler(cfg.TransportHandler.HandleUDP),
 
 		// Create stack NIC and then bind link endpoint to it.
 		withCreatingNIC(nicID, cfg.LinkEndpoint),
diff --git a/core/tcp.go b/core/tcp.go
index b1b0693..1a6d3c6 100644
--- a/core/tcp.go
+++ b/core/tcp.go
@@ -3,6 +3,7 @@ package core
 import (
 	"time"
 
+	glog "gvisor.dev/gvisor/pkg/log"
 	"gvisor.dev/gvisor/pkg/tcpip"
 	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
 	"gvisor.dev/gvisor/pkg/tcpip/header"
@@ -40,7 +41,7 @@ const (
 	tcpKeepaliveInterval = 30 * time.Second
 )
 
-func withTCPHandler(handle func(adapter.TCPConn), printf func(string, ...any)) option.Option {
+func withTCPHandler(handle func(adapter.TCPConn)) option.Option {
 	return func(s *stack.Stack) error {
 		tcpForwarder := tcp.NewForwarder(s, defaultWndSize, maxConnAttempts, func(r *tcp.ForwarderRequest) {
 			var (
@@ -52,7 +53,7 @@ func withTCPHandler(handle func(adapter.TCPConn), printf func(string, ...any)) o
 
 			defer func() {
 				if err != nil {
-					printf("forward tcp request %s:%d->%s:%d: %s",
+					glog.Warningf("forward tcp request: %s:%d->%s:%d: %s",
 						id.RemoteAddress, id.RemotePort, id.LocalAddress, id.LocalPort, err)
 				}
 			}()
diff --git a/core/udp.go b/core/udp.go
index 64df2e0..1e651df 100644
--- a/core/udp.go
+++ b/core/udp.go
@@ -1,6 +1,7 @@
 package core
 
 import (
+	glog "gvisor.dev/gvisor/pkg/log"
 	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
 	"gvisor.dev/gvisor/pkg/tcpip/stack"
 	"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
@@ -10,7 +11,7 @@ import (
 	"github.com/xjasonlyu/tun2socks/v2/core/option"
 )
 
-func withUDPHandler(handle func(adapter.UDPConn), printf func(string, ...any)) option.Option {
+func withUDPHandler(handle func(adapter.UDPConn)) option.Option {
 	return func(s *stack.Stack) error {
 		udpForwarder := udp.NewForwarder(s, func(r *udp.ForwarderRequest) {
 			var (
@@ -19,7 +20,7 @@ func withUDPHandler(handle func(adapter.UDPConn), printf func(string, ...any)) o
 			)
 			ep, err := r.CreateEndpoint(&wq)
 			if err != nil {
-				printf("udp forwarder request %s:%d->%s:%d: %s",
+				glog.Warningf("forward udp request: %s:%d->%s:%d: %s",
 					id.RemoteAddress, id.RemotePort, id.LocalAddress, id.LocalPort, err)
 				return
 			}
diff --git a/engine/engine.go b/engine/engine.go
index 11d5f79..6e67179 100644
--- a/engine/engine.go
+++ b/engine/engine.go
@@ -2,7 +2,6 @@ package engine
 
 import (
 	"errors"
-	"fmt"
 	"net"
 	"sync"
 	"time"
@@ -192,10 +191,7 @@ func netstack(k *Key) (err error) {
 	if _defaultStack, err = core.CreateStack(&core.Config{
 		LinkEndpoint:     _defaultDevice,
 		TransportHandler: &mirror.Tunnel{},
-		PrintFunc: func(format string, v ...any) {
-			log.Warnf("[STACK] %s", fmt.Sprintf(format, v...))
-		},
-		Options: opts,
+		Options:          opts,
 	}); err != nil {
 		return
 	}