diff --git a/manifests/init.pp b/manifests/init.pp
index 9c186cc..46e5cb0 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -20,20 +20,6 @@ class apt(
   $custom_sources_list = '',
   $custom_key_dir = $apt::params::custom_key_dir
 ) inherits apt::params {
-  case $::operatingsystem {
-    'debian': {
-      $real_repos = $repos ? {
-        'auto'  => 'main contrib non-free',
-        default => $repos,
-      }
-    }
-    'ubuntu': {
-      $real_repos = $repos ? {
-        'auto'  => 'main restricted universe multiverse',
-        default => $repos,
-      }
-    }
-  }
 
   $real_backports_url = $backports_url ? {
     false   => $debian_url,
diff --git a/manifests/params.pp b/manifests/params.pp
index be7262d..a70dac1 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -13,7 +13,17 @@ class apt::params () {
   }
   $lts_url = $debian_url
   $volatile_url = 'http://volatile.debian.org/debian-volatile/'
-  $repos = 'auto'
+  case $::operatingsystem {
+    'debian': {
+      $repos = 'main contrib non-free'
+    }
+    'ubuntu': {
+      $repos = 'main restricted universe multiverse'
+    }
+    default: {
+      fail("Unsupported system '${::operatingsystem}'.")
+    }
+  }
   $custom_preferences = ''
   $custom_key_dir = false
 }
diff --git a/templates/Debian/sources.list.erb b/templates/Debian/sources.list.erb
index 44eea53..c7318a2 100644
--- a/templates/Debian/sources.list.erb
+++ b/templates/Debian/sources.list.erb
@@ -4,7 +4,7 @@
 ### Debian current: <%= codename=scope.lookupvar('::debian_codename') %>
 
 # basic
-deb <%= debian_url=scope.lookupvar('apt::debian_url') %> <%= codename %> <%= lrepos=scope.lookupvar('apt::real_repos') %>
+deb <%= debian_url=scope.lookupvar('apt::debian_url') %> <%= codename %> <%= lrepos=scope.lookupvar('apt::repos') %>
 <% if include_src=scope.lookupvar('apt::include_src')  -%>
 deb-src <%= debian_url %> <%= codename %> <%= lrepos %>
 <% end -%>
diff --git a/templates/Ubuntu/sources.list.erb b/templates/Ubuntu/sources.list.erb
index e6d2f64..b90b8c8 100644
--- a/templates/Ubuntu/sources.list.erb
+++ b/templates/Ubuntu/sources.list.erb
@@ -1,8 +1,8 @@
 # This file is managed by puppet
 # all local modifications will be overwritten
 
-# basic <%= codename=scope.lookupvar('::ubuntu_codename') %>
-deb <%= ubuntu_url=scope.lookupvar('apt::ubuntu_url') %> <%= codename %> <%= lrepos=scope.lookupvar('apt::real_repos') %>
+# basic <%= codename=scope.lookupvar('apt::codename') %>
+deb <%= ubuntu_url=scope.lookupvar('apt::ubuntu_url') %> <%= codename %> <%= lrepos=scope.lookupvar('apt::repos') %>
 <% if include_src=scope.lookupvar('apt::include_src') -%>
 deb-src <%= ubuntu_url %> <%= codename %> <%= lrepos %>
 <% end -%>