diff --git a/question/category_class.php b/question/category_class.php
index 90336a0976a..20fbf10e5f7 100644
--- a/question/category_class.php
+++ b/question/category_class.php
@@ -352,7 +352,7 @@ class question_category_object {
     }
 
     function move_questions($oldcat, $newcat){
-        $questionids = get_records_select_menu('question', "category = $oldcat AND parent = 0", '', 'id,1');
+        $questionids = get_records_select_menu('question', "category = $oldcat AND (parent = 0 OR parent = id)", '', 'id,1');
         if (!question_move_questions_to_category(implode(',', array_keys($questionids)), $newcat)) {
             print_error('errormovingquestions', 'question', $returnurl, $ids);
         }