diff --git a/lib/puppet/functions/os_version_gte.rb b/lib/puppet/functions/os_version_gte.rb
index c0e0043..151c3c5 100644
--- a/lib/puppet/functions/os_version_gte.rb
+++ b/lib/puppet/functions/os_version_gte.rb
@@ -1,27 +1,27 @@
 # frozen_string_literal: true
 
 # @summary
 #   Checks if the OS version is at least a certain version.
 # > *Note:*
 # Only the major version is taken into account.
 #
 # @example Example usage:#
 #     if os_version_gte('Debian', '9') { }
 #     if os_version_gte('Ubuntu', '18.04') { }
 Puppet::Functions.create_function(:os_version_gte) do
   # @param os operating system
   # @param version
   #
   # @return [Boolean] `true` or `false
   dispatch :os_version_gte do
     param 'String[1]', :os
     param 'String[1]', :version
     return_type 'Boolean'
   end
 
   def os_version_gte(os, version)
     facts = closure_scope['facts']
     (facts['operatingsystem'] == os &&
-     Puppet::Util::Package.versioncmp(version, facts['operatingsystemmajrelease']) >= 0)
+     Puppet::Util::Package.versioncmp(facts['operatingsystemmajrelease'], version) >= 0)
   end
 end
diff --git a/spec/functions/os_version_gte_spec.rb b/spec/functions/os_version_gte_spec.rb
index 5de5838..aec4982 100644
--- a/spec/functions/os_version_gte_spec.rb
+++ b/spec/functions/os_version_gte_spec.rb
@@ -1,47 +1,50 @@
 # frozen_string_literal: true
 
 require 'spec_helper'
 
 describe 'os_version_gte' do
   context 'on Debian 9' do
     let(:facts) do
       {
         operatingsystem: 'Debian',
         operatingsystemmajrelease: '9',
       }
     end
 
+    it { is_expected.to run.with_params('Debian', '10').and_return(false) }
     it { is_expected.to run.with_params('Debian', '9').and_return(true) }
-    it { is_expected.to run.with_params('Debian', '8').and_return(false) }
-    it { is_expected.to run.with_params('Debian', '8.0').and_return(false) }
+    it { is_expected.to run.with_params('Debian', '8').and_return(true) }
+    it { is_expected.to run.with_params('Debian', '8.0').and_return(true) }
     it { is_expected.to run.with_params('Ubuntu', '16.04').and_return(false) }
     it { is_expected.to run.with_params('Fedora', '29').and_return(false) }
   end
 
   context 'on Ubuntu 16.04' do
     let(:facts) do
       {
         operatingsystem: 'Ubuntu',
         operatingsystemmajrelease: '16.04',
       }
     end
 
     it { is_expected.to run.with_params('Debian', '9').and_return(false) }
-    it { is_expected.to run.with_params('Ubuntu', '16').and_return(false) }
+    it { is_expected.to run.with_params('Ubuntu', '16').and_return(true) }
+    it { is_expected.to run.with_params('Ubuntu', '14.04').and_return(true) }
     it { is_expected.to run.with_params('Ubuntu', '16.04').and_return(true) }
-    it { is_expected.to run.with_params('Ubuntu', '18.04').and_return(true) }
+    it { is_expected.to run.with_params('Ubuntu', '18.04').and_return(false) }
+    it { is_expected.to run.with_params('Ubuntu', '20.04').and_return(false) }
     it { is_expected.to run.with_params('Fedora', '29').and_return(false) }
   end
 
   context 'with invalid params' do
     let(:facts) do
       {
         operatingsystem: 'Ubuntu',
         operatingsystemmajrelease: '16.04',
       }
     end
 
     it { is_expected.to run.with_params('123', 'abc').and_return(false) }
     it { is_expected.to run.with_params([], 123).and_raise_error(ArgumentError) }
   end
 end