diff --git a/template/en/default/global/header.html.tmpl b/template/en/default/global/header.html.tmpl
index 11899dd45dc97c4e3bc7a9d7c2bb2fc6a209001b..e4ffc12d0fce6ddf39b7b92d26c84e3be543565b 100644
--- a/template/en/default/global/header.html.tmpl
+++ b/template/en/default/global/header.html.tmpl
@@ -101,7 +101,7 @@
#%]
<body bgcolor="[% bgcolor %]" onload="[% onload %]"
- id="[% Param('urlbase').replace('^https?://','').replace('/$','').replace('[-~@:/.]+','-') %]"
+ class="[% Param('urlbase').replace('^https?://','').replace('/$','').replace('[-~@:/.]+','-') %]"
[%+ bodyattrs %]>
[%# Migration note: the following file corresponds to the old Param