diff --git a/test/test_option_consistency.py b/test/test_option_consistency.py
index 4db3410..a7ff41c 100644
--- a/test/test_option_consistency.py
+++ b/test/test_option_consistency.py
@@ -283,3 +283,14 @@ def test_consistency_not_all():
     c.a = ['192.168.1.0']
     c.b = ['255.255.255.0']
     c.c = ['192.168.1.255']
+
+
+def test_consistency_permissive():
+    a = IntOption('a', '', 1)
+    b = IntOption('b', '', 2, properties=('hidden',))
+    od = OptionDescription('od', '', [a, b])
+    a.impl_add_consistency('not_equal', b)
+    c = Config(od)
+    c.cfgimpl_get_settings().setpermissive(('hidden',))
+    c.read_write()
+    c.a = 1
diff --git a/tiramisu/option.py b/tiramisu/option.py
index 409d6eb..aafd43b 100644
--- a/tiramisu/option.py
+++ b/tiramisu/option.py
@@ -367,7 +367,8 @@ class Option(BaseOption):
                 #if context, calculate value, otherwise get default value
                 if context is not None:
                     opt_value = context._getattr(
-                        descr.impl_get_path_by_opt(opt), validate=False)
+                        descr.impl_get_path_by_opt(opt), validate=False,
+                        force_permissive=True)
                 else:
                     opt_value = opt.impl_getdefault()
 
@@ -873,7 +874,7 @@ class PortOption(Option):
                 if not self._min_value <= int(val) <= self._max_value:
                     raise ValueError(_('invalid port, must be an between {0} '
                                      'and {1}').format(self._min_value,
-                                                      self._max_value))
+                                                       self._max_value))
             except ValueError:
                 raise ValueError(_('invalid port'))