diff --git a/lib/weblib.php b/lib/weblib.php
index 40ece0f7b40..00e3a8fc0a1 100644
--- a/lib/weblib.php
+++ b/lib/weblib.php
@@ -2175,9 +2175,10 @@ function print_header ($title='', $heading='', $navigation='', $focus='',
     }
     @header('Accept-Ranges: none');
 
+    $currentlanguage = current_language();
+
     if ($usexml) {       // Added by Gustav Delius / Mad Alex for MathML output
                          // Modified by Julian Sedding
-        $currentlanguage = current_language();
         $mathplayer = preg_match("/MathPlayer/i", $_SERVER['HTTP_USER_AGENT']);
         if(!$mathplayer) {
             header('Content-Type: application/xhtml+xml');
@@ -2229,6 +2230,8 @@ function print_header ($title='', $heading='', $navigation='', $focus='',
         $pageclass .= ' drag';
     }
 
+    $pageclass .= ' lang-'.$currentlanguage;
+
     $bodytags .= ' class="'.$pageclass.'" id="'.$pageid.'"';
 
     ob_start();