diff --git a/weboob/tools/application/formatters/multiline.py b/weboob/tools/application/formatters/multiline.py
index 9d069414..2048e44a 100644
--- a/weboob/tools/application/formatters/multiline.py
+++ b/weboob/tools/application/formatters/multiline.py
@@ -24,6 +24,7 @@ __all__ = ['MultilineFormatter']
 
 class MultilineFormatter(IFormatter):
     def __init__(self, key_value_separator=u': ', after_item=u'\n'):
+        IFormatter.__init__(self)
         self.key_value_separator = key_value_separator
         self.after_item = after_item