diff --git a/atlas/templates/atlas/collection_viva.html b/atlas/templates/atlas/collection_viva.html
index b6fa2eb5..c4f2e742 100644
--- a/atlas/templates/atlas/collection_viva.html
+++ b/atlas/templates/atlas/collection_viva.html
@@ -6,8 +6,8 @@
         {% for case in cases %}
             <li data-question_pk={{case.pk}}>Case {{forloop.counter}}: {{case.title}} &nbsp;
 
-                 <button class="show-case no-padding" data-title="{{case.title}}" data-target="ohif/viewer/dicomjson?url=https://www.penracourses.org.uk{% url 'atlas:case_dicom_json' case.pk %}">Show</button>
-                 <button class="open-case no-padding" data-title="{{case.title}}" data-target="ohif/viewer/dicomjson?url=https://www.penracourses.org.uk{% url 'atlas:case_dicom_json' case.pk %}">Open</button>
+                 <button class="show-case no-padding" data-title="{{case.title}}" data-target="https://www.penracourses.org.uk/ohif/viewer/dicomjson?url=https://www.penracourses.org.uk{% url 'atlas:case_dicom_json' case.pk %}">Show</button>
+                 <button class="open-case no-padding" data-title="{{case.title}}" data-target="https://www.penracourses.org.uk/ohif/viewer/dicomjson?url=https://www.penracourses.org.uk{% url 'atlas:case_dicom_json' case.pk %}">Open</button>
             </li>
 
         {% endfor %}