diff --git a/pkg/util/iptables/iptables_test.go b/pkg/util/iptables/iptables_test.go
index c7b3fbb5981..7b672d146ab 100644
--- a/pkg/util/iptables/iptables_test.go
+++ b/pkg/util/iptables/iptables_test.go
@@ -1,3 +1,5 @@
+// +build linux
+
 /*
 Copyright 2014 The Kubernetes Authors.