diff --git a/tiramisu/option.py b/tiramisu/option.py
index f606536..67b2fa5 100644
--- a/tiramisu/option.py
+++ b/tiramisu/option.py
@@ -96,7 +96,9 @@ class BaseOption(BaseInformation):
     in options that have to be set only once, it is of course done in the
     __setattr__ method
     """
-    __slots__ = ('_readonly', '_state_consistencies', '_state_requires')
+    __slots__ = ('_name', '_requires', '_properties', '_readonly',
+                 '_consistencies', '_calc_properties', '_state_consistencies',
+                 '_state_requires')
 
     def __init__(self, name, doc, requires, properties):
         if not valid_name(name):
@@ -230,10 +232,8 @@ class Option(BaseOption):
 
     Reminder: an Option object is **not** a container for the value
     """
-    __slots__ = ('_name', '_requires', '_multi', '_validator',
-                 '_default_multi', '_default', '_properties', '_callback',
-                 '_multitype', '_master_slaves', '_consistencies',
-                 '_calc_properties', '__weakref__')
+    __slots__ = ('_multi', '_validator', '_default_multi', '_default', '_callback',
+                 '_multitype', '_master_slaves', '__weakref__')
     _empty = ''
 
     def __init__(self, name, doc, default=None, default_multi=None,