diff --git a/longs/templates/longs/mark_answer.html b/longs/templates/longs/mark_answer.html
index f751ccbe..e9b71335 100644
--- a/longs/templates/longs/mark_answer.html
+++ b/longs/templates/longs/mark_answer.html
@@ -17,10 +17,10 @@
             overview</a>, <a href="{% url 'longs:mark_overview' pk=exam.pk %}">marking
             overview</a><br/>
             {% if previous_cid %}
-            <a href="{% url 'longs:mark_answer' pk=exam.pk sk=question_details.current cid=previous_cid %}">Previous candidate</a>
+            <a href="{% url 'longs:mark_answer' pk=exam.pk sk=question_details.current|add:'-1' cid=previous_cid %}">Previous candidate</a>
             {% endif %}
             {% if next_cid %}
-            <a href="{% url 'longs:mark_answer' pk=exam.pk sk=question_details.current cid=next_cid %}">Next candidate</a>
+            <a href="{% url 'longs:mark_answer' pk=exam.pk sk=question_details.current|add:'-1' cid=next_cid %}">Next candidate</a>
             {% endif %}
             </div>
 {% endif %}