diff --git a/VERSION b/VERSION
index 86b688ed..152b91b8 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-Version 2.4.1-alpha.2+timestamp.2013.01.08.15.30.47
+Version 2.4.1-alpha.2+timestamp.2013.01.09.09.16.07
diff --git a/gluon/sqlhtml.py b/gluon/sqlhtml.py
index 7f710e51..db928d58 100644
--- a/gluon/sqlhtml.py
+++ b/gluon/sqlhtml.py
@@ -765,7 +765,7 @@ def formstyle_ul(form, fields):
 
 def formstyle_bootstrap(form, fields):
     ''' bootstrap format form layout '''
-    form['_class'] += ' form-horizontal'
+    form.add_class('form-horizontal')
     parent = FIELDSET()
     for id, label, controls, help in fields:
         # wrappers