diff --git a/materio_search_api.module b/materio_search_api.module
index 6c0c51ba..c6db4f01 100755
--- a/materio_search_api.module
+++ b/materio_search_api.module
@@ -849,7 +849,7 @@ function materio_serach_api_get_advancedsearch_tree(){
             || $child2->field_used_on_advanced_search['und'][0]['value'] == 0)
            continue;
 
-          $as_tree[$vid][$term->tid]['children'][$child->tid]['children'][] = array('tid'=>$child2->tid,'name'=>$child2->name);
+          $as_tree[$vid][$term->tid]['children'][$child->tid]['children'][$child2->tid] = array('tid'=>$child2->tid,'name'=>$child2->name);
         }
 
         if(isset($as_tree[$vid][$term->tid]['children'][$child->tid]['children']))