diff --git a/lib/facter/trust_bundle.rb b/lib/facter/trust_bundle.rb
index fc95449..18ba6b0 100644
--- a/lib/facter/trust_bundle.rb
+++ b/lib/facter/trust_bundle.rb
@@ -1,4 +1,5 @@
 Facter.add('trust_bundle') do
+  confine kernel: 'Linux'
   setcode do
     osfacts = Facter.value(:os)
     case osfacts['family']