diff --git a/gestion/numeros_disponibles.py b/gestion/numeros_disponibles.py
index 0bf6a185..0c8bbe92 100755
--- a/gestion/numeros_disponibles.py
+++ b/gestion/numeros_disponibles.py
@@ -62,12 +62,7 @@ def update_ip(plage, occupees):
                 break
             pool_ip.append(ip)
 
-    resultat = ''
-
-    for ip in pool_ip:
-      if ip not in occupees :
-        if not AddrInNet(ip, ancien_vlan_adm):  
-	  resultat += '%s\n' % ip
+    resultat = ''.join('%s\n' % ip for ip in pool_ip if ip not in occupees and not AddrInNet(ip, ancien_vlan_adm))
     
     f = open(repertoire + 'ip_' + plage,'w') 
     f.write(resultat)