diff --git a/weboob/tools/backend.py b/weboob/tools/backend.py
index 14dcc7d4..1bbc71ca 100644
--- a/weboob/tools/backend.py
+++ b/weboob/tools/backend.py
@@ -179,4 +179,4 @@ class BaseBackend(object):
             if isinstance(obj, key):
                 return value(self, obj, fields)
 
-        raise NotSupportedObject('The object of type %s is not supported by this backend' % type(obj))
+        raise NotSupportedObject('The object of type %s is not supported by the backend %s' % (type(obj), self))