diff --git a/test/test_option_consistency.py b/test/test_option_consistency.py
index e6c9507..9da0df0 100644
--- a/test/test_option_consistency.py
+++ b/test/test_option_consistency.py
@@ -222,7 +222,7 @@ def test_disabled_with_group():
 
 def make_description_callback():
     gcoption = ChoiceOption('name', 'GC name', ('ref', 'framework'), 'ref')
-    gcdummy = BoolOption('dummy', 'dummy', callback="toto")
+    gcdummy = BoolOption('dummy', 'dummy')
     objspaceoption = ChoiceOption('objspace', 'Object space',
                                   ('std', 'thunk'), 'std')
     booloption = BoolOption('bool', 'Test boolean option', default=True)
diff --git a/tiramisu/value.py b/tiramisu/value.py
index ece79bd..bc0ceea 100644
--- a/tiramisu/value.py
+++ b/tiramisu/value.py
@@ -79,6 +79,9 @@ class Values(object):
     def __getitem__(self, opt):
         return self.getitem(opt)
 
+    def get_modified_values(self):
+        return self._values
+
     def getitem(self, opt, validate=True, force_permissive=False,
                 force_properties=None):
         if opt in self._cache: