diff --git a/question/type/calculated/classes/qtype_calculated_answer.php b/question/type/calculated/classes/qtype_calculated_answer.php
index fc42766ab56..f9ccef221b9 100644
--- a/question/type/calculated/classes/qtype_calculated_answer.php
+++ b/question/type/calculated/classes/qtype_calculated_answer.php
@@ -35,4 +35,10 @@ class qtype_calculated_answer extends \qtype_numerical_answer {
 
     /** @var int The format of the correct answer. */
     public $correctanswerformat;
+
+    /** @var int The max tolerance of the correct answer. */
+    public $max;
+
+    /** @var int The min tolerance of the correct answer. */
+    public $min;
 }