diff --git a/lisp/ox-html.el b/lisp/ox-html.el
index d247635e2..48b913aa6 100644
--- a/lisp/ox-html.el
+++ b/lisp/ox-html.el
@@ -217,7 +217,7 @@
("xhtml-frameset" . "")
("xhtml-11" . "")
+\"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd\">")
("html5" . "")
("xhtml5" . ""))