diff --git a/rapids/templates/rapids/mark.html b/rapids/templates/rapids/mark.html
index 40d72d38..751bc5fc 100644
--- a/rapids/templates/rapids/mark.html
+++ b/rapids/templates/rapids/mark.html
@@ -76,7 +76,7 @@
                         <ul id="new-answer-list" class="answer-list rapid">
                             {% for answer, mark in review_user_answers %}
                                 <li>
-                                    <pre><span class="answer not-marked" dataset-mark="{{mark}}">{{ answer }}</span></pre>
+                                    <pre><span class="answer not-marked" data-mark="{{mark}}">{{ answer }}</span></pre>
                                 </li>
                             {% endfor %}
                         </ul>