diff --git a/tiramisu/option/option.py b/tiramisu/option/option.py
index 15c471c..5b72236 100644
--- a/tiramisu/option/option.py
+++ b/tiramisu/option/option.py
@@ -21,6 +21,7 @@
 # ____________________________________________________________
 import re
 import sys
+import datetime
 from IPy import IP
 from types import FunctionType
 from ..setting import undefined