diff --git a/net/dns/ini.go b/net/dns/ini.go
index 802eda5b0..4e270d4bd 100644
--- a/net/dns/ini.go
+++ b/net/dns/ini.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build windows
+
 package dns
 
 import (
diff --git a/net/dns/ini_test.go b/net/dns/ini_test.go
index d41fa9462..8236f5f48 100644
--- a/net/dns/ini_test.go
+++ b/net/dns/ini_test.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build windows
+
 package dns
 
 import (