diff --git a/addons/fleet/models/fleet_vehicle_cost.py b/addons/fleet/models/fleet_vehicle_cost.py
index 56265f8da3d..e0462213389 100644
--- a/addons/fleet/models/fleet_vehicle_cost.py
+++ b/addons/fleet/models/fleet_vehicle_cost.py
@@ -246,7 +246,7 @@ class FleetVehicleLogContract(models.Model):
                 ], offset=0, limit=1, order='date desc')
                 if last_autogenerated_cost:
                     found = True
-                    startdate = last_autogenerated_cost.date.date()
+                    startdate = last_autogenerated_cost.date
             if found:
                 startdate += deltas.get(contract.cost_frequency)
             today = fields.Date.context_today(self)