diff --git a/test/test_config.py b/test/test_config.py
index a5e7b75..997e660 100644
--- a/test/test_config.py
+++ b/test/test_config.py
@@ -251,6 +251,18 @@ def test_get_modified_values():
     assert to_tuple(api.value.exportation()) == (('od.g5', 'od.g6'), (None, None), ('yes', tuple()), ('user', 'user'))
 
 
+def test_get_modified_values_not_modif():
+    g1 = StrOption('g1', '', multi=True)
+    d1 = OptionDescription('od', '', [g1])
+    root = OptionDescription('root', '', [d1])
+    config = Config(root)
+    api = getapi(config)
+    assert api.option('od.g1').value.get() == []
+    value = api.option('od.g1').value.get()
+    value.append('val')
+    assert api.option('od.g1').value.get() == []
+
+
 #def test_has_value():
 #    g1 = IntOption('g1', '', 1)
 #    g2 = StrOption('g2', '', 'héhé')
diff --git a/tiramisu/value.py b/tiramisu/value.py
index 3d1659b..fc0f12e 100644
--- a/tiramisu/value.py
+++ b/tiramisu/value.py
@@ -115,6 +115,9 @@ class Values(object):
                               value,
                               setting_properties,
                               config_bag.properties)
+        if isinstance(value, list):
+            # return a copy, so value cannot be modified
+            return value.copy()
         # and return it
         return value