diff --git a/sdk/resource/host_id.go b/sdk/resource/host_id.go
index 32a616d0879..39e35f4f2bf 100644
--- a/sdk/resource/host_id.go
+++ b/sdk/resource/host_id.go
@@ -38,6 +38,7 @@ type fileReader func(string) (string, error)
 
 type commandExecutor func(string, ...string) (string, error)
 
+// nolint: unused  // This is used by the hostReaderBSD, gated by build tags.
 func readFile(filename string) (string, error) {
 	b, err := os.ReadFile(filename)
 	if err != nil {