diff --git a/maintenance.py b/maintenance.py
index 413bb41..3757d6b 100644
--- a/maintenance.py
+++ b/maintenance.py
@@ -13,7 +13,7 @@ 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