diff --git a/go.mod b/go.mod
index 57a6294b8..5f0cb5ddd 100644
--- a/go.mod
+++ b/go.mod
@@ -4,7 +4,6 @@ go 1.16
 
 require (
 	github.com/go-sql-driver/mysql v1.6.0
-	github.com/huandu/go-clone v1.2.2
 	github.com/patrickmn/go-cache v2.1.0+incompatible // indirect
 	github.com/refraction-networking/utls v0.0.0-20201210053706-2179f286686b
 	github.com/shadowsocks/go-shadowsocks2 v0.1.5
diff --git a/go.sum b/go.sum
index 0f24f2e8d..9778cfacc 100644
--- a/go.sum
+++ b/go.sum
@@ -158,10 +158,6 @@ github.com/hashicorp/mdns v1.0.0/go.mod h1:tL+uN++7HEJ6SQLQ2/p+z2pH24WQKWjBPkE0m
 github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2pPBoIllUwCN7I=
 github.com/hashicorp/serf v0.8.2/go.mod h1:6hOLApaqBFA1NXqRQAsxw9QxuDEvNxSQRwA/JwenrHc=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
-github.com/huandu/go-assert v1.1.5 h1:fjemmA7sSfYHJD7CUqs9qTwwfdNAx7/j2/ZlHXzNB3c=
-github.com/huandu/go-assert v1.1.5/go.mod h1:yOLvuqZwmcHIC5rIzrBhT7D3Q9c3GFnd0JrPVhn/06U=
-github.com/huandu/go-clone v1.2.2 h1:u6acA9meOiaf9arN8iOR17WcRLE9vab2PmCh6xdHTuw=
-github.com/huandu/go-clone v1.2.2/go.mod h1:bPJ9bAG8fjyAEBRFt6toaGUZcGFGL3f6g5u6yW+9W14=
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
 github.com/jellevandenhooff/dkim v0.0.0-20150330215556-f50fe3d243e1/go.mod h1:E0B/fFc00Y+Rasa88328GlI/XbtyysCtTHZS8h7IrBU=
 github.com/jhump/protoreflect v1.8.2 h1:k2xE7wcUomeqwY0LDCYA16y4WWfyTcMx5mKhk0d4ua0=
@@ -308,7 +304,6 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
-github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
diff --git a/tunnel/tls/server.go b/tunnel/tls/server.go
index 1a600a84a..f9f66d717 100644
--- a/tunnel/tls/server.go
+++ b/tunnel/tls/server.go
@@ -17,8 +17,6 @@ import (
 	"sync/atomic"
 	"time"
 
-	"github.com/huandu/go-clone"
-
 	"github.com/p4gefau1t/trojan-go/common"
 	"github.com/p4gefau1t/trojan-go/config"
 	"github.com/p4gefau1t/trojan-go/log"
@@ -50,7 +48,6 @@ type Server struct {
 	cancel             context.CancelFunc
 	underlay           tunnel.Server
 	nextHTTP           int32
-	setNextHTTPOnce    sync.Once
 	portOverrider      map[string]int
 }
 
@@ -107,8 +104,7 @@ func (s *Server) acceptLoop() {
 					if s.verifySNI && !matched {
 						return nil, common.NewError("sni mismatched: " + hello.ServerName + ", expected: " + s.sni)
 					}
-					keyPairCopied := clone.Clone(&s.keyPair[0]).(*tls.Certificate)
-					return keyPairCopied, nil
+					return &s.keyPair[0], nil
 				},
 			}
 
@@ -209,6 +205,8 @@ func (s *Server) AcceptPacket(tunnel.Tunnel) (tunnel.PacketConn, error) {
 
 func (s *Server) checkKeyPairLoop(checkRate time.Duration, keyPath string, certPath string, password string) {
 	var lastKeyBytes, lastCertBytes []byte
+	ticker := time.NewTicker(checkRate)
+
 	for {
 		log.Debug("checking cert...")
 		keyBytes, err := ioutil.ReadFile(keyPath)
@@ -234,11 +232,13 @@ func (s *Server) checkKeyPairLoop(checkRate time.Duration, keyPath string, certP
 			lastKeyBytes = keyBytes
 			lastCertBytes = certBytes
 		}
+
 		select {
-		case <-time.After(checkRate):
+		case <-ticker.C:
 			continue
 		case <-s.ctx.Done():
 			log.Debug("exiting")
+			ticker.Stop()
 			return
 		}
 	}