diff --git a/plugins/FeedsPlugin.inc b/plugins/FeedsPlugin.inc
index 2bb09482f7e4b1139f261885b68646fd2e95212c..debc4eec7da3e5c70d9c860af0b4465daebb8fd2 100644
--- a/plugins/FeedsPlugin.inc
+++ b/plugins/FeedsPlugin.inc
@@ -88,7 +88,7 @@ abstract class FeedsPlugin extends FeedsConfigurable implements FeedsSourceInter
     static $loaded = FALSE;
     if (!$loaded) {
       $path = drupal_get_path('module', 'feeds') .'/mappers';
-      $files = drupal_system_listing('.*\.inc$', $path, 'name', 0);
+      $files = drupal_system_listing('/.*\.inc$/', $path, 'name', 0);
       foreach ($files as $file) {
         if (strstr($file->filename, '/mappers/')) {
           require_once("./$file->filename");