diff --git a/app/views/layouts/base.html.erb b/app/views/layouts/base.html.erb
index 83cbd7786..1d469fc40 100644
--- a/app/views/layouts/base.html.erb
+++ b/app/views/layouts/base.html.erb
@@ -1,7 +1,7 @@
-<!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" xml:lang="en">
+<!DOCTYPE html>
+<html lang="en">
 <head>
-<meta http-equiv="content-type" content="text/html; charset=utf-8" />
+<meta charset="utf-8" />
 <title><%=h html_title %></title>
 <meta name="description" content="<%= Redmine::Info.app_name %>" />
 <meta name="keywords" content="issue,bug,tracker" />
