diff --git a/include/functions.php b/include/functions.php
index 8894f8162..73c5e39fb 100644
--- a/include/functions.php
+++ b/include/functions.php
@@ -2562,7 +2562,7 @@
 
 			$config = HTMLPurifier_Config::createDefault();
 
-			$allowed = "p,a[href],i,em,b,strong,code,pre,blockquote,br,img[src|alt|title|align|hspace],ul,ol,li,h1,h2,h3,h4,s,object[classid|type|id|name|width|height|codebase],param[name|value],table,tr,td";
+			$allowed = "p,a[href],i,em,b,strong,code,pre,blockquote,br,img[src|alt|title|align|hspace],ul,ol,li,h1,h2,h3,h4,s,object[classid|type|id|name|width|height|codebase],param[name|value],table,tr,td,span[class]";
 
 			$config->set('HTML.SafeObject', true);
 			@$config->set('HTML', 'Allowed', $allowed);