diff --git a/lib/facter/iptables_persistent_version.rb b/lib/facter/iptables_persistent_version.rb
index ff66f0d0d..c67659df6 100644
--- a/lib/facter/iptables_persistent_version.rb
+++ b/lib/facter/iptables_persistent_version.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 Facter.add(:iptables_persistent_version) do
-  confine operatingsystem: ['Debian', 'Ubuntu']
+  confine 'os.name': ['Debian', 'Ubuntu']
   setcode do
     # Throw away STDERR because dpkg >= 1.16.7 will make some noise if the
     # package isn't currently installed.
diff --git a/spec/unit/facter/iptables_persistent_version_spec.rb b/spec/unit/facter/iptables_persistent_version_spec.rb
index 835137af0..471460b92 100644
--- a/spec/unit/facter/iptables_persistent_version_spec.rb
+++ b/spec/unit/facter/iptables_persistent_version_spec.rb
@@ -15,8 +15,8 @@
 
       describe "#{os} package installed" do
         before(:each) do
-          allow(Facter.fact(:operatingsystem)).to receive(:value).and_return(os)
-          allow(Facter.fact(:operatingsystemrelease)).to receive(:value).and_return(os_release)
+          allow(Facter.fact(:'os.name')).to receive(:value).and_return(os)
+          allow(Facter.fact(:'os.release.full')).to receive(:value).and_return(os_release)
           allow(Facter::Core::Execution).to receive(:execute).with(dpkg_cmd, { on_fail: nil })
                                                              .and_return(ver)
         end
@@ -27,8 +27,8 @@
 
     describe 'Ubuntu package not installed' do
       before(:each) do
-        allow(Facter.fact(:operatingsystem)).to receive(:value).and_return('Ubuntu')
-        allow(Facter.fact(:operatingsystemrelease)).to receive(:value).and_return('20.04')
+        allow(Facter.fact(:'os.name')).to receive(:value).and_return('Ubuntu')
+        allow(Facter.fact(:'os.release.full')).to receive(:value).and_return('20.04')
         allow(Facter::Core::Execution).to receive(:execute).with(dpkg_cmd, { on_fail: nil })
                                                            .and_return(nil)
       end
@@ -38,7 +38,7 @@
 
     describe 'CentOS not supported' do
       before(:each) do
-        allow(Facter.fact(:operatingsystem)).to receive(:value)
+        allow(Facter.fact(:'os.name')).to receive(:value)
           .and_return('CentOS')
       end
 
@@ -63,8 +63,8 @@
 
       describe "#{os} package installed" do
         before(:each) do
-          allow(Facter.fact(:operatingsystem)).to receive(:value).and_return(os)
-          allow(Facter.fact(:operatingsystemrelease)).to receive(:value).and_return(os_release)
+          allow(Facter.fact(:'os.name')).to receive(:value).and_return(os)
+          allow(Facter.fact(:'os.release.full')).to receive(:value).and_return(os_release)
           allow(Facter::Core::Execution).to receive(:execute).with(dpkg_cmd, { on_fail: nil })
                                                              .and_return(ver)
         end
@@ -76,8 +76,8 @@
     describe 'Ubuntu package not installed' do
       os_release = '14.10'
       before(:each) do
-        allow(Facter.fact(:operatingsystem)).to receive(:value).and_return('Ubuntu')
-        allow(Facter.fact(:operatingsystemrelease)).to receive(:value).and_return(os_release)
+        allow(Facter.fact(:'os.name')).to receive(:value).and_return('Ubuntu')
+        allow(Facter.fact(:'os.release.full')).to receive(:value).and_return(os_release)
         allow(Facter::Core::Execution).to receive(:execute).with(dpkg_cmd, { on_fail: nil })
                                                            .and_return(nil)
       end
@@ -87,7 +87,7 @@
 
     describe 'CentOS not supported' do
       before(:each) do
-        allow(Facter.fact(:operatingsystem)).to receive(:value)
+        allow(Facter.fact(:'os.name')).to receive(:value)
           .and_return('CentOS')
       end