diff --git a/django/contrib/admindocs/templates/admin_doc/model_index.html b/django/contrib/admindocs/templates/admin_doc/model_index.html
index 4dd7caa2a6..47c94c0c70 100644
--- a/django/contrib/admindocs/templates/admin_doc/model_index.html
+++ b/django/contrib/admindocs/templates/admin_doc/model_index.html
@@ -36,7 +36,7 @@
 <ul>
 {% regroup models by app_label as grouped_models %}
 {% for group in grouped_models %}
-    <li><a href="#{{ group.grouper }}">{{ group.grouper|capfirst }}</a></li>
+    <li><a href="#app-{{ group.grouper }}">{{ group.grouper|capfirst }}</a></li>
 {% endfor %}
 </ul>
 </div>