diff --git a/v3/pkg/w32/image.go b/v3/pkg/w32/image.go
index 4a3036c1..1c7520f3 100644
--- a/v3/pkg/w32/image.go
+++ b/v3/pkg/w32/image.go
@@ -1,3 +1,5 @@
+//go:build windows
+
 package w32
 
 import (
diff --git a/v3/pkg/w32/popupmenu.go b/v3/pkg/w32/popupmenu.go
index 926071b8..9604cc92 100644
--- a/v3/pkg/w32/popupmenu.go
+++ b/v3/pkg/w32/popupmenu.go
@@ -1,3 +1,5 @@
+//go:build windows
+
 package w32
 
 type Menu HMENU