diff --git a/weboob/backends/aum/optim/profiles_walker.py b/weboob/backends/aum/optim/profiles_walker.py
index 9b049df9..476313f5 100644
--- a/weboob/backends/aum/optim/profiles_walker.py
+++ b/weboob/backends/aum/optim/profiles_walker.py
@@ -51,10 +51,11 @@ class ProfilesWalker(Optimization):
         return True
 
     def stop(self):
-        # TODO
-        # self.event.cancel(self.event)
-        # self.event = None
-        return False
+        self.sched.cancel(self.walk_cron)
+        self.sched.cancel(self.view_cron)
+        self.walk_cron = None
+        self.view_cron = None
+        return True
 
     def is_running(self):
         return self.walk_cron is not None
@@ -97,4 +98,5 @@ class ProfilesWalker(Optimization):
             except Exception, e:
                 print e
         finally:
-            self.sched.schedule(randint(10,40), self.view_profile)
+            if self.view_cron is not None:
+                self.view_cron = self.sched.schedule(randint(10,40), self.view_profile)
diff --git a/weboob/backends/aum/optim/visibility.py b/weboob/backends/aum/optim/visibility.py
index 76e5847e..7b7d7ced 100644
--- a/weboob/backends/aum/optim/visibility.py
+++ b/weboob/backends/aum/optim/visibility.py
@@ -36,8 +36,9 @@ class Visibility(Optimization):
         return True
 
     def stop(self):
-        # TODO
-        return False
+        self.sched.cancel(self.cron)
+        self.cron = None
+        return True
 
     def is_running(self):
         return self.cron is not None