diff --git a/gestion/wifi-update.py b/gestion/wifi-update.py
index b67da857..b9b35c9e 100755
--- a/gestion/wifi-update.py
+++ b/gestion/wifi-update.py
@@ -37,6 +37,7 @@
 
 # TODO: meilleure gestion des erreurs
 
+import time, os
 import commands,re
 
 # On utilise twisted
@@ -202,7 +203,9 @@ class UpdateFactory(protocol.ServerFactory):
         def getSAD_lock(self, getre, delre, host):
             # ETAPE 2
             # Plus de lock pour le moment...
-            return getSAD_script(self, getre, delre, host)
+            d = defer.succeed(None)
+            d.addCallback(lambda _: getSAD_script(self, getre, delre, host))
+            return d
 
         def getSAD_script(self, getre, delre, host):
             # ETAPE 3
@@ -262,8 +265,6 @@ class UpdateFactory(protocol.ServerFactory):
 
 class ReverseEngine:
 
-    import time
-
     def __init__(self):
         self.iphost = None
         self.lastupdate = 0