diff --git a/test/test_config_domain.py b/test/test_config_domain.py
index ab6e00e..a491350 100644
--- a/test/test_config_domain.py
+++ b/test/test_config_domain.py
@@ -7,7 +7,8 @@ from tiramisu.option import DomainnameOption, OptionDescription
 
 def test_domainname():
     d = DomainnameOption('d', '')
-    od = OptionDescription('a', '', [d])
+    e = DomainnameOption('e', '', "toto.com")
+    od = OptionDescription('a', '', [d, e])
     c = Config(od)
     c.d = 'toto.com'
     raises(ValueError, "c.d = 'toto'")
@@ -21,7 +22,8 @@ def test_domainname():
 
 def test_domainname_netbios():
     d = DomainnameOption('d', '', type_='netbios')
-    od = OptionDescription('a', '', [d])
+    e = DomainnameOption('e', '', "toto", type_='netbios')
+    od = OptionDescription('a', '', [d, e])
     c = Config(od)
     raises(ValueError, "c.d = 'toto.com'")
     c.d = 'toto'
@@ -30,7 +32,8 @@ def test_domainname_netbios():
 
 def test_domainname_hostname():
     d = DomainnameOption('d', '', type_='hostname')
-    od = OptionDescription('a', '', [d])
+    e = DomainnameOption('e', '', "toto", type_='hostname')
+    od = OptionDescription('a', '', [d, e])
     c = Config(od)
     raises(ValueError, "c.d = 'toto.com'")
     c.d = 'toto'
diff --git a/tiramisu/option.py b/tiramisu/option.py
index 6fc9395..970d348 100644
--- a/tiramisu/option.py
+++ b/tiramisu/option.py
@@ -528,7 +528,6 @@ class NetmaskOption(Option):
 class DomainnameOption(Option):
     __slots__ = ('_opt_type', '_type', '_allow_ip')
     _opt_type = 'domainname'
-    #allow_ip
 
     def __init__(self, name, doc, default=None, default_multi=None,
                  requires=None, multi=False, callback=None,
@@ -538,6 +537,12 @@ class DomainnameOption(Option):
         #hostname: to identify the device
         #domainname:
         #fqdn: with tld, not supported yet
+        if type_ not in ['netbios', 'hostname', 'domainname']:
+            raise ValueError(_('unknown type_ {0} for hostname').format(type_))
+        self._type = type_
+        if allow_ip not in [True, False]:
+            raise ValueError(_('allow_ip must be a boolean'))
+        self._allow_ip = allow_ip
         super(DomainnameOption, self).__init__(name, doc, default=default,
                                                default_multi=default_multi,
                                                callback=callback,
@@ -547,10 +552,6 @@ class DomainnameOption(Option):
                                                validator=validator,
                                                validator_args=validator_args,
                                                properties=properties)
-        if type_ not in ['netbios', 'hostname', 'domainname']:
-            raise ValueError(_('unknown type_ {0} for hostname').format(type_))
-        self._type = type_
-        self._allow_ip = allow_ip
 
     def _validate(self, value):
         if self._allow_ip is True: