diff --git a/tiramisu/option/masterslave.py b/tiramisu/option/masterslave.py
index 847d644..b0f6b46 100644
--- a/tiramisu/option/masterslave.py
+++ b/tiramisu/option/masterslave.py
@@ -229,7 +229,7 @@ class MasterSlaves(object):
                 else:
                     return value
             elif index is None:
-                multi.append(value, setitem=False, force=True, validate=validate,
+                multi.append(value, setitem=False, force=True, validate=False,
                              force_permissive=force_permissive)
             else:
                 multi = value