diff --git a/html/html/themes/ipfire/include/functions.pl b/html/html/themes/ipfire/include/functions.pl
index 0ead967ae..44ed9b758 100644
--- a/html/html/themes/ipfire/include/functions.pl
+++ b/html/html/themes/ipfire/include/functions.pl
@@ -120,7 +120,7 @@ sub openpage {
 	}
 
 print <<END;
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<!DOCTYPE html>
 <html>
 	<head>
 	<title>$headline - $title</title>
