diff --git a/layouts/_default/baseof.html b/layouts/_default/baseof.html
index 42a6217..35f53f3 100644
--- a/layouts/_default/baseof.html
+++ b/layouts/_default/baseof.html
@@ -8,7 +8,7 @@
     <meta http-equiv="content-type" content="text/html; charset=UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   </head>
-  <body id="{{ .File.ContentBaseName }}" class="{{ .Page.Section }}">
+  <body id="{{ with .File }}{{ .ContentBaseName }}{{ end }}" class="{{ .Page.Section }}">
     {{- block "header" . }}{{ end }}
     {{ partial "sidebar.html" . }}
     {{- block "main" . }}{{ end }}
