diff --git a/question.php b/question.php
index 249ce14..7a246f6 100755
--- a/question.php
+++ b/question.php
@@ -70,7 +70,7 @@ class qtype_gapfill_question extends question_graded_automatically_with_countbac
      *
      * @var boolean
      */
-    public $letterhints;
+    public $singleuse;