diff --git a/lib/facter/java_version.rb b/lib/facter/java_version.rb
index 1c427a8..a9d9c18 100644
--- a/lib/facter/java_version.rb
+++ b/lib/facter/java_version.rb
@@ -23,7 +23,7 @@ Facter.add(:java_version) do
   # Additionally, facter versions prior to 2.0.1 only support
   # positive matches, so this needs to be done manually in setcode.
   setcode do
-    unless ['darwin'].include? Facter.value(:operatingsystem).downcase
+    unless ['darwin'].include? Facter.value(:kernel).downcase
       version = nil
       if Facter::Util::Resolution.which('java')
         Facter::Util::Resolution.exec('java -Xmx12m -version 2>&1').lines.each { |line| version = Regexp.last_match(1) if %r{^.+ version \"(.+)\"} =~ line }
@@ -34,7 +34,7 @@ Facter.add(:java_version) do
 end
 
 Facter.add(:java_version) do
-  confine operatingsystem: 'Darwin'
+  confine kernel: 'Darwin'
   has_weight 100
   setcode do
     unless Facter::Util::Resolution.exec('/usr/libexec/java_home --failfast 2>&1').include?('Unable to find any JVMs matching version')
diff --git a/spec/unit/facter/java_version_spec.rb b/spec/unit/facter/java_version_spec.rb
index bb4b167..2f31f6b 100644
--- a/spec/unit/facter/java_version_spec.rb
+++ b/spec/unit/facter/java_version_spec.rb
@@ -32,9 +32,9 @@ describe 'java_version' do
     end
     context 'when on Darwin' do
       before(:each) do
-        allow(Facter.fact(:operatingsystem)).to receive(:value).and_return('Darwin')
+        allow(Facter.fact(:kernel)).to receive(:value).and_return('Darwin')
       end
-      let(:facts) { { operatingsystem: 'Darwin' } }
+      let(:facts) { { kernel: 'Darwin' } }
 
       it do
         expect(Facter::Util::Resolution).to receive(:exec).with('/usr/libexec/java_home --failfast 2>&1').and_return('/Library/Java/JavaVirtualMachines/jdk1.7.0_71.jdk/Contents/Home')
@@ -71,9 +71,9 @@ describe 'java_version' do
     end
     context 'when on Darwin' do
       before(:each) do
-        allow(Facter.fact(:operatingsystem)).to receive(:value).and_return('Darwin')
+        allow(Facter.fact(:kernel)).to receive(:value).and_return('Darwin')
       end
-      let(:facts) { { operatingsystem: 'Darwin' } }
+      let(:facts) { { kernel: 'Darwin' } }
 
       it do
         expect(Facter::Util::Resolution).to receive(:exec).with('/usr/libexec/java_home --failfast 2>&1').at_least(1).and_return('Unable to find any JVMs matching version "(null)".')