diff --git a/partner_industry_secondary/models/res_partner.py b/partner_industry_secondary/models/res_partner.py
index ec3334a9b..9bf96a0a2 100644
--- a/partner_industry_secondary/models/res_partner.py
+++ b/partner_industry_secondary/models/res_partner.py
@@ -17,7 +17,8 @@ class ResPartner(models.Model):
 
     @api.constrains('industry_id', 'secondary_industry_ids')
     def _check_industries(self):
-        if self.industry_id in self.secondary_industry_ids:
-            raise exceptions.ValidationError(
-                _('The main industry must be different '
-                  'from the secondary industries.'))
+        for partner in self:
+            if partner.industry_id in partner.secondary_industry_ids:
+                raise exceptions.ValidationError(
+                    _('The main industry must be different '
+                      'from the secondary industries.'))