diff --git a/addons/mrp/models/mrp_unbuild.py b/addons/mrp/models/mrp_unbuild.py
index 9d57f1b71b9..052d96ced7e 100644
--- a/addons/mrp/models/mrp_unbuild.py
+++ b/addons/mrp/models/mrp_unbuild.py
@@ -276,7 +276,7 @@ class MrpUnbuild(models.Model):
         self.ensure_one()
         precision = self.env['decimal.precision'].precision_get('Product Unit of Measure')
         available_qty = self.env['stock.quant']._get_available_quantity(self.product_id, self.location_id, self.lot_id, strict=True)
-        unbuild_qty = self.product_uom_id._compute_quantity(self.scrap_qty, self.product_id.uom_id)
+        unbuild_qty = self.product_uom_id._compute_quantity(self.product_qty, self.product_id.uom_id)
         if float_compare(available_qty, unbuild_qty, precision_digits=precision) >= 0:
             return self.action_unbuild()
         else: