diff --git a/maintenance.py b/maintenance.py
index 0493304..180d72d 100644
--- a/maintenance.py
+++ b/maintenance.py
@@ -14,7 +14,7 @@ from trytond.modules.product import price_digits
 import datetime
 from datetime import timedelta
 
-# from scipy.stats import t
+from scipy.stats import t
 import matplotlib.pyplot as plt
 import numpy as np
 import math as mt