diff --git a/tiramisu/autolib.py b/tiramisu/autolib.py
index e92c663..6a659a3 100644
--- a/tiramisu/autolib.py
+++ b/tiramisu/autolib.py
@@ -44,9 +44,11 @@ def carry_out_calculation(name, config, callback, callback_params):
     for key, values in callback_params.items():
         for value in values:
             if type(value) == tuple:
-                if config is None:
-                    raise ConfigError(_('no config specified but needed'))
                 path, check_disabled = value
+                if config is None:
+                    if check_disabled:
+                        continue
+                    raise ConfigError(_('no config specified but needed'))
                 try:
                     opt_value = config._getattr(path, force_permissive=True)
                     opt = config.unwrap_from_path(path)