diff --git a/addons/project_caldav/project_caldav.py b/addons/project_caldav/project_caldav.py
index 65e61c6e4cd..70789d89dec 100644
--- a/addons/project_caldav/project_caldav.py
+++ b/addons/project_caldav/project_caldav.py
@@ -21,6 +21,7 @@
 
 from osv import fields, osv
 from caldav import calendar
+from datetime import datetime
 
 class project_task(osv.osv):
     _name = "project.task"