diff --git a/freeradius/auth.py b/freeradius/auth.py
index 96cf0c03..57e197b5 100644
--- a/freeradius/auth.py
+++ b/freeradius/auth.py
@@ -352,7 +352,7 @@ def decide_vlan(data, is_wifi, conn):
         # prise d'un autre adhérent à jour de cotisation
         force_ma = False
         is_ma = proprio.has_key('droits')
-        if chbre is None and is_ma:
+        if chbre is None and not is_ma:
             decision =  "accueil", u"Chambre inconnue"
         elif chbre is not None:
             chbre = escape_ldap(chbre)