diff --git a/employee.py b/employee.py
index 1883c05..7aba1c3 100644
--- a/employee.py
+++ b/employee.py
@@ -34,7 +34,7 @@ class Employee(metaclass=PoolMeta):
     @classmethod
     def create_mandatory_wages(cls, employees_ids):
         MandatoryWage = Pool().get('staff.payroll.mandatory_wage')
-        employees = Employee.browse(employees_ids)
+        employees = cls.browse(employees_ids)
         values = []
         for employee in employees:
             if employee.category and employee.category.wages_default: