diff --git a/tiramisu/setting.py b/tiramisu/setting.py
index f371e5b..ff1288e 100644
--- a/tiramisu/setting.py
+++ b/tiramisu/setting.py
@@ -473,7 +473,8 @@ class Settings(object):
                     not self._getcontext().cfgimpl_get_values()._isempty(
                         opt_or_descr, value):
                 properties.remove('mandatory')
-            elif not is_write and 'empty' in forced_properties and \
+            elif opt_or_descr.impl_is_multi() and \
+                    not is_write and 'empty' in forced_properties and \
                     not opt_or_descr.impl_is_master_slaves('slave') and \
                     self._getcontext().cfgimpl_get_values()._isempty(
                         opt_or_descr, value, force_allow_empty_list=True):