diff --git a/dav_event_office/templates/dav_event_office/event_detail.html b/dav_event_office/templates/dav_event_office/event_detail.html
index ede551e..194d0c5 100644
--- a/dav_event_office/templates/dav_event_office/event_detail.html
+++ b/dav_event_office/templates/dav_event_office/event_detail.html
@@ -315,12 +315,12 @@
                         <div>
                             <button disabled="disabled"
                                     class="btn btn-link no-padding" title="Anmeldung wurde bereits bearbeitet">
-                                <span class="{% if registration.status.accepted %}text-success{% else %}text-muted{% endif %}">{% bootstrap_icon 'plus-sign' %}</span>
+                                <span class="{% if registration.status.accepted == True %}text-success{% else %}text-muted{% endif %}">{% bootstrap_icon 'plus-sign' %}</span>
                             </button>
                             &nbsp;
                             <button disabled="disabled"
                                     class="btn btn-link no-padding" title="Anmeldung wurde bereits bearbeitet">
-                                <span class="{% if not registration.status.accepted %}text-danger{% else %}text-muted{% endif %}">{% bootstrap_icon 'minus-sign' %}</span>
+                                <span class="{% if registration.status.accepted == False %}text-danger{% else %}text-muted{% endif %}">{% bootstrap_icon 'minus-sign' %}</span>
                             </button>
                             &nbsp;
                             <span class="text-muted">
@@ -398,4 +398,4 @@
         </div>
     </div>
 </div>
-{% endblock page-container-fluid %}
\ No newline at end of file
+{% endblock page-container-fluid %}