diff --git a/city_model_structure/monthly_to_hourly_demand.py b/city_model_structure/monthly_to_hourly_demand.py
index b52da7a1..374e9076 100644
--- a/city_model_structure/monthly_to_hourly_demand.py
+++ b/city_model_structure/monthly_to_hourly_demand.py
@@ -4,10 +4,10 @@ SPDX - License - Identifier: LGPL - 3.0 - or -later
 Copyright © 2020 Project Author Pilar Monsalvete pilar_monsalvete@yahoo.es
 """
 import pandas as pd
-import helpers.constants as cte
 from city_model_structure.attributes.occupancy import Occupancy
 import calendar as cal
 
+
 class MonthlyToHourlyDemand:
   """
   MonthlyToHourlyDemand class