diff --git a/manifests/preferences_snippet.pp b/manifests/preferences_snippet.pp
index 0c7b7bb..99feac4 100644
--- a/manifests/preferences_snippet.pp
+++ b/manifests/preferences_snippet.pp
@@ -31,7 +31,8 @@ define apt::preferences_snippet (
 
   file { "/etc/apt/preferences.d/${name}":
     ensure => $ensure,
-    owner  => root, group => 0, mode => '0644';
+    owner  => root, group => 0, mode => '0644',
+    before => Exec['refresh_apt'];
   }
 
   case $source {