diff --git a/doc/lib/BackRestDoc/Html/DocHtmlPage.pm b/doc/lib/BackRestDoc/Html/DocHtmlPage.pm
index 39d7cbffc..a858da4a1 100644
--- a/doc/lib/BackRestDoc/Html/DocHtmlPage.pm
+++ b/doc/lib/BackRestDoc/Html/DocHtmlPage.pm
@@ -135,9 +135,13 @@ sub process
             {
                 my $oRenderOut = $self->{oManifest}->renderOutGet(RENDER_TYPE_HTML, $strRenderOutKey);
 
-                $oMenuBody->
-                    addNew(HTML_DIV, 'menu')->
-                        addNew(HTML_A, 'menu-link', {strContent => $$oRenderOut{menu}, strRef => "${strRenderOutKey}.html"});
+                if (defined($$oRenderOut{menu}))
+                {
+                    $oMenuBody->addNew(HTML_DIV, 'menu')->addNew(
+                        HTML_A, 'menu-link',
+                        {strContent => $$oRenderOut{menu},
+                            strRef => $strRenderOutKey eq 'index' ? '{[project-url-root]}' : "${strRenderOutKey}.html"});
+                }
             }
         }
     }
diff --git a/doc/xml/release.xml b/doc/xml/release.xml
index 4f6f1685d..28b8d5063 100644
--- a/doc/xml/release.xml
+++ b/doc/xml/release.xml
@@ -203,6 +203,10 @@
                     <release-item>
                         <p>Add <setting>--out-preserve</setting> to preserve contents of output path.</p>
                     </release-item>
+
+                    <release-item>
+                        <p>Restore index menu url default lost in b85e51d6.</p>
+                    </release-item>
                 </release-development-list>
             </release-doc-list>