diff --git a/psnotify/psnotify.go b/psnotify/psnotify.go
index ffc4649a8..3ec254a80 100644
--- a/psnotify/psnotify.go
+++ b/psnotify/psnotify.go
@@ -1,3 +1,5 @@
+// +build darwin freebsd linux netbsd openbsd
+
 package psnotify
 
 import (