diff --git a/purchase_report_date_planned/models/purchase_report.py b/purchase_report_date_planned/models/purchase_report.py
index c9df7df..e5b094b 100644
--- a/purchase_report_date_planned/models/purchase_report.py
+++ b/purchase_report_date_planned/models/purchase_report.py
@@ -7,9 +7,9 @@ class PurchaseReport(models.Model):
     date_planned = fields.Datetime(store=True)
 
     def _select(self):
-        select_str = super(PurchaseReport, self)._select()
+        select_str = super()._select()
         return select_str + ", l.date_planned as date_planned"
 
     def _group_by(self):
-        group_by_str = super(PurchaseReport, self)._group_by()
+        group_by_str = super()._group_by()
         return group_by_str + ", l.date_planned"