diff --git a/weboob/tools/browser2/filters/standard.py b/weboob/tools/browser2/filters/standard.py
index 217b279f..5239fdd9 100644
--- a/weboob/tools/browser2/filters/standard.py
+++ b/weboob/tools/browser2/filters/standard.py
@@ -86,6 +86,9 @@ class _Filter(object):
         else:
             raise exception
 
+    def __str__(self):
+        return self.__class__.__name__
+
 
 class Filter(_Filter):
     """