diff --git a/data/templates/default.html5 b/data/templates/default.html5
index 5c484f376..9c15107c0 100644
--- a/data/templates/default.html5
+++ b/data/templates/default.html5
@@ -29,7 +29,7 @@ $highlighting-css$
   </style>
 $endif$
 $for(css)$
-  <link rel="stylesheet" href="$css$">
+  <link rel="stylesheet" href="$css$" />
 $endfor$
 $if(math)$
   $math$