diff --git a/weboob/tools/browser2/filters.py b/weboob/tools/browser2/filters.py
index 4340508f9755cfa81ddad0139dc6697f8f45df7e..17c714aafe057ad01064be3783f2999756d569fc 100644
--- a/weboob/tools/browser2/filters.py
+++ b/weboob/tools/browser2/filters.py
@@ -209,7 +209,9 @@ def filter(self, txt):
 
     @classmethod
     def clean(cls, txt):
-        return html2text(html.tostring(txt, encoding=unicode))
+        if not isinstance(txt, basestring):
+            txt = html.tostring(txt, encoding=unicode)
+        return html2text(txt)
 
 
 class RawText(Filter):