diff --git a/tiramisu/option.py b/tiramisu/option.py
index df7c985..f85c3ad 100644
--- a/tiramisu/option.py
+++ b/tiramisu/option.py
@@ -451,9 +451,7 @@ class Option(BaseOption):
             do_validation(value, force_index)
         else:
             if not isinstance(value, list):
-                raise ValueError(_("invalid value {0} for option {1} ")
-                                 _("which must be a list").format(value,
-                                                                  self._name))
+                raise ValueError(_("invalid value {0} for option {1} which must be a list").format(value, self._name))
             for index, val in enumerate(value):
                 do_validation(val, index)
 
diff --git a/translations/fr/tiramisu.po b/translations/fr/tiramisu.po
index ec9e66d..bff777c 100644
--- a/translations/fr/tiramisu.po
+++ b/translations/fr/tiramisu.po
@@ -116,8 +116,8 @@ msgid "invalid value for option {0}: {1}"
 msgstr "valeur invalide pour l'option {0} : {1}"
 
 #: tiramisu/option.py:454
-msgid "which must be a list"
-msgstr "lequel doit être une liste"
+msgid ""invalid value {0} for option {1} which must be a list"
+msgstr "valeur invalide pour l'option {0} : {1} laquelle doit être une liste"
 
 #: tiramisu/option.py:514
 msgid "consistency should be set with an option"