diff --git a/tiramisu/option.py b/tiramisu/option.py
index be1e81f..8cb6638 100644
--- a/tiramisu/option.py
+++ b/tiramisu/option.py
@@ -58,10 +58,7 @@ class Multi(list):
             super(Multi, self).__init__(lst)
             # we add the slaves without modifying the master
             for l in lst:
-                try:
-                    self.append(l, add_master=False)
-                except Exception, err:
-                    print err
+                self.append(l, add_master=False)
         else:
             if force_append:
                 self.config._valid_len(self.opt._name, lst)
@@ -84,7 +81,8 @@ class Multi(list):
         except TypeError:
             self._setvalue(value, who=settings.get_owner())
         multis = []
-        for name, multi in self.config:
+        for opt in self.config._cfgimpl_descr._children:
+            multi = self.config._cfgimpl_values[opt._name]
             multis.append(multi)
         for multi in multis:
             if master == multi.opt._name: