diff --git a/sysadm/_templates/layout.html b/sysadm/_templates/layout.html
index 7b7eca6..d3a1d16 100644
--- a/sysadm/_templates/layout.html
+++ b/sysadm/_templates/layout.html
@@ -1,19 +1,21 @@
+{% extends "!layout.html" %}
+
 {# copied from sphinx_rtd_theme/layout.html, with the extra "Development Documentation" link #}
 {%- block menu %}
   {%- set toctree = toctree(maxdepth=theme_navigation_depth|int,
                             collapse=theme_collapse_navigation|tobool,
                             includehidden=theme_includehidden|tobool,
                             titles_only=theme_titles_only|tobool) %}
   {%- if toctree %}
     {{ toctree }}
   {%- else %}
     <!-- Local TOC -->
     <div class="local-toc">{{ toc }}</div>
   {%- endif %}
 
   <hr />
 
   <ul>
       <li class="toctree-l1"><a href="../devel/">Development Documentation</a></li>
   </ul>
 {%- endblock %}