diff --git a/phpBB/templates/subSilver/overall_header.tpl b/phpBB/templates/subSilver/overall_header.tpl
index f60a32af28..e4ef97b46f 100644
--- a/phpBB/templates/subSilver/overall_header.tpl
+++ b/phpBB/templates/subSilver/overall_header.tpl
@@ -1,4 +1,7 @@
-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<!-- 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"> -->
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html" />
