diff --git a/peercred_unix_test.go b/peercred_unix_test.go
index 474deef..2540fdd 100644
--- a/peercred_unix_test.go
+++ b/peercred_unix_test.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build go1.15 && (linux || darwin || freebsd)
 // +build go1.15
 // +build linux darwin freebsd