diff --git a/act/artifactcache/utils_windows.go b/act/artifactcache/utils_windows.go
index 99798115..90b0f112 100644
--- a/act/artifactcache/utils_windows.go
+++ b/act/artifactcache/utils_windows.go
@@ -1,3 +1,5 @@
+//go:build windows
+
 package artifactcache
 
 import "syscall"