diff --git a/gestion/gest_crans.py b/gestion/gest_crans.py
index 5b541489..ff438e6e 100644
--- a/gestion/gest_crans.py
+++ b/gestion/gest_crans.py
@@ -1413,7 +1413,7 @@ def set_machine(machine):
     try: machine.mac(result[1])
     except ValueError, c:
         if len(c.args)>1 and c.args[1] == 1 \
-                and (isadm or machine.proprietaire().chbre()[0] == 'G'):
+                and (isadm or machine.nom().endswith("-g.crans.org")):
             # Mac en double
             arg = u'--title "Adresse MAC" '
             arg += u'--yesno "L\'adresse MAC existe déja, continuer ? \n" 0 0'