diff --git a/addons/mrp/models/mrp_bom.py b/addons/mrp/models/mrp_bom.py
index ec90c55d020..031e4f20e27 100644
--- a/addons/mrp/models/mrp_bom.py
+++ b/addons/mrp/models/mrp_bom.py
@@ -81,6 +81,8 @@ class MrpBom(models.Model):
     def onchange_product_tmpl_id(self):
         if self.product_tmpl_id:
             self.product_uom_id = self.product_tmpl_id.uom_id.id
+            if self.product_id.product_tmpl_id != self.product_tmpl_id:
+                self.product_id = False
 
     @api.onchange('routing_id')
     def onchange_routing_id(self):