--- lib/facter/domain.rb.orig	2019-06-11 04:26:10 UTC
+++ lib/facter/domain.rb
@@ -31,7 +31,7 @@ Facter.add(:domain) do
     basic_hostname = 'hostname 2> /dev/null'
     windows_hostname = 'hostname > NUL'
     full_hostname = 'hostname -f 2> /dev/null'
-    can_do_hostname_f = Regexp.union /Linux/i, /FreeBSD/i, /Darwin/i
+    can_do_hostname_f = Regexp.union /Linux/i, /FreeBSD/i, /Darwin/i, /BSDSUniX/i
 
     hostname_command = if Facter.value(:kernel) =~ can_do_hostname_f
                          full_hostname