diff --git a/src/DeleteEntity.php b/src/DeleteEntity.php
index 1203bae..7ed9e1e 100755
--- a/src/DeleteEntity.php
+++ b/src/DeleteEntity.php
@@ -11,7 +11,8 @@ class DeleteEntity {
     $context['results']['bundle'] = $bundle;
     $context['results']['count'] = $total_count;
   }
-  function deleteEntityFinishedCallback($success, $results, $operations) {
+
+  public static function deleteEntityFinishedCallback($success, $results, $operations) {
     if ($success) {
       if ($results['bundle'] == 'all') {
         $message = t('Successfully deleted @num @entity(s).', array('@num' => $results['count'], '@entity' => $results['entity']));