diff --git a/templates/bulletproof/index.tpl b/templates/bulletproof/index.tpl
index 8328c10d..4c70c2c5 100644
--- a/templates/bulletproof/index.tpl
+++ b/templates/bulletproof/index.tpl
@@ -5,7 +5,7 @@
         <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
     {/if}
 
-    <html{if $is_xhtml} xmlns="http://www.w3.org/1999/xhtml" xml:lang="{$lang}" lang="{$lang}"{/if}>
+    <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="{$lang}" lang="{$lang}">
     <head>
         <title>{$head_title|@default:$blogTitle}{if $head_subtitle} - {$head_subtitle}{/if}</title>
         {serendipity_hookPlugin hook="frontend_header"}
