diff --git a/tiramisu/config.py b/tiramisu/config.py
index d6399a2..d024159 100644
--- a/tiramisu/config.py
+++ b/tiramisu/config.py
@@ -537,7 +537,7 @@ class _CommonConfig(SubConfig):
         for subclass in self.__class__.__mro__:
             if subclass is not object:
                 slots.update(subclass.__slots__)
-        slots -= frozenset(['_impl_context', '__weakref__'])
+        slots -= frozenset(['_impl_context', '_impl_meta', '__weakref__'])
         state = {}
         for slot in slots:
             try:
@@ -564,6 +564,7 @@ class _CommonConfig(SubConfig):
         storage = get_storage(test=self._impl_test, **state['_storage'])
         self._impl_values._impl_setstate(storage)
         self._impl_settings._impl_setstate(storage)
+        self._impl_meta = None
 
 
 # ____________________________________________________________
diff --git a/translations/fr/tiramisu.po b/translations/fr/tiramisu.po
index 256a0da..93e30f4 100644
--- a/translations/fr/tiramisu.po
+++ b/translations/fr/tiramisu.po
@@ -79,7 +79,7 @@ msgstr "l'attribut {2} de l'objet '{0}' ({1}) est en lecture seule"
 
 #: tiramisu/option.py:142 tiramisu/value.py:360
 msgid "information's item not found: {0}"
-msgstr "aucune config spécifié alors que c'est nécessaire"
+msgstr "aucune config spécifiée alors que c'est nécessaire"
 
 #: tiramisu/option.py:204
 msgid "cannot serialize Option, only in OptionDescription"