diff --git a/tiramisu/autolib.py b/tiramisu/autolib.py
index 2ea37e6..0002f5c 100644
--- a/tiramisu/autolib.py
+++ b/tiramisu/autolib.py
@@ -19,8 +19,8 @@
 # the whole pypy projet is under MIT licence
 # ____________________________________________________________
 "enables us to carry out a calculation and return an option's value"
-from tiramisu.error import PropertiesOptionError, ConflictConfigError,
-    NoValueReturned
+from tiramisu.error import (PropertiesOptionError, ConflictConfigError,
+    NoValueReturned)
 # ____________________________________________________________
 # automatic Option object
 #def special_owner_factory(name, owner, value,