diff --git a/django/contrib/admindocs/templates/admin_doc/template_filter_index.html b/django/contrib/admindocs/templates/admin_doc/template_filter_index.html
index 53383edc23..7470762775 100644
--- a/django/contrib/admindocs/templates/admin_doc/template_filter_index.html
+++ b/django/contrib/admindocs/templates/admin_doc/template_filter_index.html
@@ -15,7 +15,7 @@
     <h2>{% firstof library.grouper "Built-in filters" %}</h2>
     {% if library.grouper %}<p class="small quiet">To use these filters, put <code>{% templatetag openblock %} load {{ library.grouper }} {% templatetag closeblock %}</code> in your template before using the filter.</p><hr />{% endif %}
     {% for filter in library.list|dictsort:"name" %}
-    <h3 id="{{ filter.name }}">{{ filter.name }}</h3>
+    <h3 id="{{ library.grouper|default_if_none:"built_in" }}-{{ filter.name }}">{{ filter.name }}</h3>
     <p>{{ filter.title }}</p>
     <p>{{ filter.body }}</p>
     {% if not forloop.last %}<hr />{% endif %}
@@ -36,7 +36,7 @@
     <h2>{% firstof library.grouper "Built-in filters" %}</h2>
     <ul>
     {% for filter in library.list|dictsort:"name" %}
-        <li><a href="#{{ filter.name }}">{{ filter.name }}</a></li>
+        <li><a href="#{{ library.grouper|default_if_none:"built_in" }}-{{ filter.name }}">{{ filter.name }}</a></li>
     {% endfor %}
     </ul>
 </div>
diff --git a/django/contrib/admindocs/templates/admin_doc/template_tag_index.html b/django/contrib/admindocs/templates/admin_doc/template_tag_index.html
index a4ad66fd96..774130bd70 100644
--- a/django/contrib/admindocs/templates/admin_doc/template_tag_index.html
+++ b/django/contrib/admindocs/templates/admin_doc/template_tag_index.html
@@ -15,7 +15,7 @@
     <h2>{% firstof library.grouper "Built-in tags" %}</h2>
     {% if library.grouper %}<p class="small quiet">To use these tags, put <code>{% templatetag openblock %} load {{ library.grouper }} {% templatetag closeblock %}</code> in your template before using the tag.</p><hr />{% endif %}
     {% for tag in library.list|dictsort:"name" %}
-    <h3 id="{{ tag.name }}">{{ tag.name }}</h3>
+    <h3 id="{{ library.grouper|default_if_none:"built_in" }}-{{ tag.name }}">{{ tag.name }}</h3>
     <h4>{{ tag.title }}</h4>
     <p>{{ tag.body }}</p>
     {% if not forloop.last %}<hr />{% endif %}
@@ -36,7 +36,7 @@
     <h2>{% firstof library.grouper "Built-in tags" %}</h2>
     <ul>
     {% for tag in library.list|dictsort:"name" %}
-        <li><a href="#{{ tag.name }}">{{ tag.name }}</a></li>
+        <li><a href="#{{ library.grouper|default_if_none:"built_in" }}-{{ tag.name }}">{{ tag.name }}</a></li>
     {% endfor %}
     </ul>
 </div>