diff --git a/addons/mrp/models/mrp_production.py b/addons/mrp/models/mrp_production.py
index 1706115273a..37a7436333b 100644
--- a/addons/mrp/models/mrp_production.py
+++ b/addons/mrp/models/mrp_production.py
@@ -2283,8 +2283,7 @@ class MrpProduction(models.Model):
         if 'confirmed' in self.mapped('state'):
             production.move_raw_ids._adjust_procure_method()
             (production.move_raw_ids | production.move_finished_ids).write({'state': 'confirmed'})
-            production.workorder_ids._action_confirm()
-            production.state = 'confirmed'
+            production.action_confirm()
 
         self.with_context(skip_activity=True)._action_cancel()
         # set the new deadline of origin moves (stock to pre prod)