diff --git a/cmd/captured/filterexpr.go b/cmd/captured/filterexpr.go
index f05b4a6..759c8ec 100644
--- a/cmd/captured/filterexpr.go
+++ b/cmd/captured/filterexpr.go
@@ -1,3 +1,4 @@
+//go:build ignore
 // +build ignore
 
 // Copyright 2018 Google Inc.