diff --git a/addons/purchase_stock/models/product.py b/addons/purchase_stock/models/product.py
index 725b96f4646..3e0e4963205 100644
--- a/addons/purchase_stock/models/product.py
+++ b/addons/purchase_stock/models/product.py
@@ -126,7 +126,8 @@ class SupplierInfo(models.Model):
         orderpoint = self.env['stock.warehouse.orderpoint'].browse(orderpoint_id)
         if not orderpoint:
             return
-        orderpoint.route_id = self.env['stock.rule'].search([('action', '=', 'buy')], limit=1).route_id.id
+        if 'buy' not in orderpoint.route_id.rule_ids.mapped('action'):
+            orderpoint.route_id = self.env['stock.rule'].search([('action', '=', 'buy')], limit=1).route_id.id
         orderpoint.supplier_id = self
         supplier_min_qty = self.product_uom._compute_quantity(self.min_qty, orderpoint.product_id.uom_id)
         if orderpoint.qty_to_order < supplier_min_qty: