diff --git a/gestion/ldap_crans.py b/gestion/ldap_crans.py
index 83289609..189d6125 100644
--- a/gestion/ldap_crans.py
+++ b/gestion/ldap_crans.py
@@ -2839,8 +2839,7 @@ Contactez nounou si la MAC est bien celle d'une carte.""", 3)
             elif not isinstance(proprio, Adherent) or proprio.adherentPayant():
                 proprio_subnet = 'adherents'
                 try:
-                    chbre = proprio.chbre()
-                    if chbre and chbre[0] == 'G':
+                    if self.nom().endswith("-g.crans.org"):
                         proprio_subnet = 'adh-g'
                     net = config.NETs[proprio_subnet]
                     pool_ip = lister_ip_dispo(proprio_subnet)