diff --git a/mod/choice/backup/moodle2/backup_choice_stepslib.php b/mod/choice/backup/moodle2/backup_choice_stepslib.php
index d211a2dbd8e..bd9b0c24a8f 100644
--- a/mod/choice/backup/moodle2/backup_choice_stepslib.php
+++ b/mod/choice/backup/moodle2/backup_choice_stepslib.php
@@ -39,7 +39,7 @@ class backup_choice_activity_structure_step extends backup_activity_structure_st
         // Define each element separated
         $choice = new backup_nested_element('choice', array('id'), array(
             'name', 'intro', 'introformat', 'publish',
-            'showresults', 'display', 'allowupdate', 'allowunanswered',
+            'showresults', 'display', 'allowupdate', 'showunanswered',
             'limitanswers', 'timeopen', 'timeclose', 'timemodified',
             'completionsubmit'));