diff --git a/muk_models_groupby_hour/models.py b/muk_models_groupby_hour/models.py
index ac9c439..cb60626 100644
--- a/muk_models_groupby_hour/models.py
+++ b/muk_models_groupby_hour/models.py
@@ -24,6 +24,7 @@ import pytz
 import hashlib
 import logging
 import psycopg2
+import dateutil
 
 from odoo import _
 from odoo import models, api, fields