diff --git a/modules/book/book-export-html.tpl.php b/modules/book/book-export-html.tpl.php
index 4b25a76..3e2e136 100644
--- a/modules/book/book-export-html.tpl.php
+++ b/modules/book/book-export-html.tpl.php
@@ -17,7 +17,7 @@
  */
 ?>
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml" lang="<?php print $language->language; ?>" xml:lang="<?php print $language->language; ?>">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="<?php print $language->language; ?>" xml:lang="<?php print $language->language; ?>" dir="<?php print $language->dir; ?>">
   <head>
     <title><?php print $title; ?></title>
     <?php print $head; ?>
