diff --git a/ipv4_linux_test.go b/ipv4_linux_test.go
index 54f6884..9d1705c 100644
--- a/ipv4_linux_test.go
+++ b/ipv4_linux_test.go
@@ -1,4 +1,5 @@
-// +build linux,darwin
+// +build linux darwin
+
 package water
 
 import (