diff --git a/spec/acceptance/apt_spec.rb b/spec/acceptance/apt_spec.rb
index c948df2..882c066 100644
--- a/spec/acceptance/apt_spec.rb
+++ b/spec/acceptance/apt_spec.rb
@@ -23,14 +23,16 @@ describe 'apt class' do
           'preferences'    => true,
           'preferences.d'  => true,
         },
-        sources => {
-          'puppetlabs' => {
-            'ensure'   => present,
-            'location' => 'http://apt.puppetlabs.com',
-            'repos'    => 'main',
-            'key'      => {
-              'id'     => '47B320EB4C7C375AA9DAE1A01054B7A24BD6EC30',
-              'server' => 'pgp.mit.edu',
+        sources => ? $::lsbdiscodename {
+          'lucid' => undef,
+          default => { 'puppetlabs' => {
+              'ensure'   => present,
+              'location' => 'http://apt.puppetlabs.com',
+              'repos'    => 'main',
+              'key'      => {
+                'id'     => '47B320EB4C7C375AA9DAE1A01054B7A24BD6EC30',
+                'server' => 'pgp.mit.edu',
+              },
             },
           },
         },