diff --git a/.golangci.yml b/.golangci.yml
index f32f75c..d596be5 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -1,9 +1,10 @@
 linters-settings:
   errcheck:
-    ignore: fmt:.*,io/ioutil:^Read.*
     ignoretests: true
     exclude-functions:
-      - github.com/fumiama/WireGold/helper.(*Writer).Write.*
+      - fmt:.*
+      - io/ioutil:^Read.*
+      - github.com/fumiama/WireGold/helper.(*Writer).(Write.*)
       - github.com/fumiama/WireGold/upper/services/tunnel.(*Tunnel).(Write|Read)
 
   goimports:
diff --git a/gold/link/peer.go b/gold/link/peer.go
index 991e912..631c047 100644
--- a/gold/link/peer.go
+++ b/gold/link/peer.go
@@ -41,8 +41,8 @@ func (m *Me) AddPeer(cfg *PeerConfig) (l *Link) {
 		allowtrans:     cfg.AllowTrans,
 		usezstd:        cfg.UseZstd,
 		me:             m,
-		mtu:            uint16(cfg.MTU),
-		mturandomrange: uint16(cfg.MTURandomRange),
+		mtu:            cfg.MTU,
+		mturandomrange: cfg.MTURandomRange,
 	}
 
 	if !cfg.NoPipe {
diff --git a/lower/nic.go b/lower/nic.go
index c688bf2..e6495a9 100644
--- a/lower/nic.go
+++ b/lower/nic.go
@@ -57,6 +57,7 @@ func (n *NIC) Close() error {
 	return n.ifce.Close()
 }
 
+// nolint: unparam
 func execute(c string, args ...string) {
 	logrus.Printf("[lower] exec cmd: %v %v:", c, args)
 	cmd := exec.Command(c, args...)