diff --git a/sites/all/modules/contrib/term_reference_tree/term_reference_tree.module b/sites/all/modules/contrib/term_reference_tree/term_reference_tree.module
index 7dbcf84..a31e468 100644
--- a/sites/all/modules/contrib/term_reference_tree/term_reference_tree.module
+++ b/sites/all/modules/contrib/term_reference_tree/term_reference_tree.module
@@ -154,6 +154,8 @@ function _term_reference_tree_get_children($tid, $vid) {
     $terms[$term->tid] = $term;
   }
 
+  drupal_alter('term_reference_get_children', $terms);
+
   return $terms;
 }