diff --git a/feeds_ui/feeds_ui.admin.inc b/feeds_ui/feeds_ui.admin.inc
index d0fa062e282bb96aac357db48d9c751530cc1c6a..4bd6c3b69080bc104847a6aefa264a4696ea10b0 100644
--- a/feeds_ui/feeds_ui.admin.inc
+++ b/feeds_ui/feeds_ui.admin.inc
@@ -546,7 +546,7 @@ function feeds_ui_mapping_form($form, &$form_state, $importer) {
     }
   }
 
-  if ($source_options) {
+  if (isset($source_options)) {
     $form['source'] = array(
       '#type' => 'select',
       '#options' => array('' => t('Select a source')) + $source_options,