diff --git a/net/tstun/tun.go b/net/tstun/tun.go
index fde2a2ad7..d04725fcd 100644
--- a/net/tstun/tun.go
+++ b/net/tstun/tun.go
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !js
+// +build !js
+
 // Package tun creates a tuntap device, working around OS-specific
 // quirks if necessary.
 package tstun