diff --git a/tiramisu/config.py b/tiramisu/config.py
index c97fb60..12e23bf 100644
--- a/tiramisu/config.py
+++ b/tiramisu/config.py
@@ -192,9 +192,9 @@ class Config(object):
                     opt_or_descr.has_properties():
                 raise PropertiesOptionError("trying to access"
                         " to an option named: {0}".format(name), 
-                        opt_or_descr.properties))
+                        opt_or_descr.properties)
             if self._cfgimpl_toplevel._cfgimpl_has_properties() and \
-                    self._cfgimpl_descr.has_properties()):
+                    self._cfgimpl_descr.has_properties():
                 raise PropertiesOptionError("trying to access"
                         " to an option's group named: {0}"
                         " for option named: {1}".format(