diff --git a/addons/mrp/models/mrp_production.py b/addons/mrp/models/mrp_production.py
index cd8adbb2984..52254b25b82 100644
--- a/addons/mrp/models/mrp_production.py
+++ b/addons/mrp/models/mrp_production.py
@@ -639,7 +639,7 @@ class MrpProduction(models.Model):
     @api.onchange('bom_id')
     def _onchange_bom_id(self):
         if not self.product_id and self.bom_id:
-            self.product_id = self.bom_id.product_id or self.bom_id.product_tmpl_id.product_variant_ids[0]
+            self.product_id = self.bom_id.product_id or self.bom_id.product_tmpl_id.product_variant_ids[:1]
         self.product_qty = self.bom_id.product_qty or 1.0
         self.product_uom_id = self.bom_id and self.bom_id.product_uom_id.id or self.product_id.uom_id.id
         self.move_raw_ids = [(2, move.id) for move in self.move_raw_ids.filtered(lambda m: m.bom_line_id)]