diff --git a/gestion/lock.py b/gestion/lock.py
index 44a411de..569e86fd 100755
--- a/gestion/lock.py
+++ b/gestion/lock.py
@@ -26,7 +26,7 @@ def wait_lock(lock_name, lock_comment='', d=None):
             # On est en mode synchrone
             return defer.succeed(None)
         # On appelle le callback car on est en mode asynchrone
-        d.callback()
+        d.callback(None)
     except AssertionError:
         # On a pas le lock
         if not d: