diff --git a/weboob/tools/value.py b/weboob/tools/value.py
index 6c306980..a52b8e32 100644
--- a/weboob/tools/value.py
+++ b/weboob/tools/value.py
@@ -163,6 +163,10 @@ class ValueBackendPassword(Value):
         return Value.check_valid(self, passwd)
 
     def set(self, passwd):
+        if self.is_command(passwd):
+            self._value = passwd
+            return
+
         self.check_valid(passwd)
         if passwd is None:
             # no change