diff --git a/addons/mrp/models/mrp_production.py b/addons/mrp/models/mrp_production.py
index 281e90047ee..9a6c17c136e 100644
--- a/addons/mrp/models/mrp_production.py
+++ b/addons/mrp/models/mrp_production.py
@@ -1134,7 +1134,8 @@ class MrpProduction(models.Model):
         self.ensure_one()
         self.lot_producing_id = self.env['stock.production.lot'].create({
             'product_id': self.product_id.id,
-            'company_id': self.company_id.id
+            'company_id': self.company_id.id,
+            'name': self.env['stock.production.lot']._get_next_serial(self.company_id, self.product_id) or self.env['ir.sequence'].next_by_code('stock.lot.serial'),
         })
         if self.move_finished_ids.filtered(lambda m: m.product_id == self.product_id).move_line_ids:
             self.move_finished_ids.filtered(lambda m: m.product_id == self.product_id).move_line_ids.lot_id = self.lot_producing_id
@@ -1747,7 +1748,7 @@ class MrpProduction(models.Model):
             message += "\n".join(component.name for component in multiple_lot_components)
         if message:
             raise UserError(message)
-        next_serial = self.env['stock.production.lot'].get_next_serial(self.company_id, self.product_id)
+        next_serial = self.env['stock.production.lot']._get_next_serial(self.company_id, self.product_id)
         action = self.env["ir.actions.actions"]._for_xml_id("mrp.act_assign_serial_numbers_production")
         action['context'] = {
             'default_production_id': self.id,
diff --git a/addons/stock/models/stock_move.py b/addons/stock/models/stock_move.py
index 7741fe7e8e9..1bb5fe23c1c 100644
--- a/addons/stock/models/stock_move.py
+++ b/addons/stock/models/stock_move.py
@@ -649,7 +649,7 @@ class StockMove(models.Model):
             view = self.env.ref('stock.view_stock_move_nosuggest_operations')
 
         if self.product_id.tracking == "serial" and self.state == "assigned":
-            self.next_serial = self.env['stock.production.lot'].get_next_serial(self.company_id, self.product_id)
+            self.next_serial = self.env['stock.production.lot']._get_next_serial(self.company_id, self.product_id)
 
         return {
             'name': _('Detailed Operations'),
diff --git a/addons/stock/models/stock_production_lot.py b/addons/stock/models/stock_production_lot.py
index 7e5e748b76d..f6364de6592 100644
--- a/addons/stock/models/stock_production_lot.py
+++ b/addons/stock/models/stock_production_lot.py
@@ -61,7 +61,7 @@ class ProductionLot(models.Model):
         return lot_names
 
     @api.model
-    def get_next_serial(self, company, product):
+    def _get_next_serial(self, company, product):
         """Return the next serial number to be attributed to the product."""
         if product.tracking == "serial":
             last_serial = self.env['stock.production.lot'].search(