diff --git a/addons/hr_payroll/hr_payroll.py b/addons/hr_payroll/hr_payroll.py
index cd374cbb91f..e677f708624 100644
--- a/addons/hr_payroll/hr_payroll.py
+++ b/addons/hr_payroll/hr_payroll.py
@@ -21,6 +21,7 @@
 ##############################################################################
 
 import time
+import datetime
 from datetime import date
 from datetime import datetime
 from datetime import timedelta