diff --git a/addons/maintenance/models/maintenance.py b/addons/maintenance/models/maintenance.py
index ae96a3e6cf6..49d27a2b182 100644
--- a/addons/maintenance/models/maintenance.py
+++ b/addons/maintenance/models/maintenance.py
@@ -176,7 +176,7 @@ class MaintenanceEquipment(models.Model):
                 if next_date < date_now:
                     next_date = date_now
             else:
-                next_date = self.effective_date + timedelta(days=equipment.period)
+                next_date = equipment.effective_date + timedelta(days=equipment.period)
             equipment.next_action_date = next_date
         (self - equipments).next_action_date = False