diff --git a/cmds/portmaster-start/install_windows.go b/cmds/portmaster-start/install_windows.go
index c0728ad8..5f1d5bb2 100644
--- a/cmds/portmaster-start/install_windows.go
+++ b/cmds/portmaster-start/install_windows.go
@@ -19,8 +19,6 @@ import (
 	"golang.org/x/sys/windows/svc/mgr"
 )
 
-const exeSuffix = ".exe"
-
 func init() {
 	rootCmd.AddCommand(installCmd)
 	installCmd.AddCommand(installService)
diff --git a/cmds/portmaster-start/service_windows.go b/cmds/portmaster-start/service_windows.go
index 598d478f..67ebb57c 100644
--- a/cmds/portmaster-start/service_windows.go
+++ b/cmds/portmaster-start/service_windows.go
@@ -88,7 +88,7 @@ service:
 	return ssec, errno
 }
 
-func runService(cmd *cobra.Command, opts *Options, cmdArgs []string) error {
+func runService(_ *cobra.Command, opts *Options, cmdArgs []string) error {
 	// check if we are running interactively
 	isDebug, err := svc.IsAnInteractiveSession()
 	if err != nil {
diff --git a/firewall/interception/nfqexp/nfqexp.go b/firewall/interception/nfqexp/nfqexp.go
index 45c358e6..1f17a9f4 100644
--- a/firewall/interception/nfqexp/nfqexp.go
+++ b/firewall/interception/nfqexp/nfqexp.go
@@ -1,3 +1,5 @@
+// +build linux
+
 // Package nfqexp contains a nfqueue library experiment.
 package nfqexp
 
diff --git a/firewall/interception/nfqexp/packet.go b/firewall/interception/nfqexp/packet.go
index 826ecaca..dcb11fa0 100644
--- a/firewall/interception/nfqexp/packet.go
+++ b/firewall/interception/nfqexp/packet.go
@@ -1,3 +1,5 @@
+// +build linux
+
 package nfqexp
 
 import (