--- includes/context.inc.orig	2009-04-28 12:59:30.000000000 -0700
+++ includes/context.inc	2009-04-28 13:02:08.000000000 -0700
@@ -68,7 +68,11 @@
  *   system locations.
  */
 function _drush_config_file($context) {
-  $configs = array();
+  $configs = array(
+    'custom' => NULL,
+    'site' => NULL,
+    'drupal' => NULL
+  );
 
   // Did the user explicitly specify a config file?
   if ($config = drush_get_option(array('c', 'config'))) {