--- lib/facter/netmask.rb.orig	2019-06-11 04:36:32 UTC
+++ lib/facter/netmask.rb
@@ -17,7 +17,7 @@
 require 'facter/util/netmask'
 
 Facter.add("netmask") do
-  confine :kernel => [ :sunos, :linux, :freebsd, :openbsd, :netbsd, :darwin, :"gnu/kfreebsd", :dragonfly, :AIX ]
+  confine :kernel => [ :bsdsunix, :sunos, :linux, :freebsd, :openbsd, :netbsd, :darwin, :"gnu/kfreebsd", :dragonfly, :AIX ]
   setcode do
     Facter::NetMask.get_netmask
   end