diff --git a/amanda/lib/facter/amanda.rb b/amanda/lib/facter/amanda.rb
index 2b6ba96..3e4a93d 100644
--- a/amanda/lib/facter/amanda.rb
+++ b/amanda/lib/facter/amanda.rb
@@ -1,4 +1,5 @@
 Facter.add('amanda_serverkey') do
+    confine :kernel => :linux
     setcode do
         begin
             match = File.read('/var/lib/amanda/.ssh/id_rsa_amdump.pub')[/^ssh-rsa ([^ ]+)/, 1]
@@ -13,6 +14,7 @@ Facter.add('amanda_serverkey') do
 end
 
 Facter.add('amanda_clientkey') do
+    confine :kernel => :linux
     setcode do
         begin
             match = File.read('/var/lib/amanda/.ssh/id_rsa_amrecover.pub')[/^ssh-rsa ([^ ]+)/, 1]