diff --git a/odoo/addons/base/models/res_partner.py b/odoo/addons/base/models/res_partner.py
index b93bca5426b..b43032ffbeb 100644
--- a/odoo/addons/base/models/res_partner.py
+++ b/odoo/addons/base/models/res_partner.py
@@ -527,7 +527,7 @@ class Partner(models.Model):
             vals['website'] = self._clean_website(vals['website'])
         if vals.get('parent_id'):
             vals['company_name'] = False
-        if vals.get('company_id'):
+        if 'company_id' in vals:
             company = self.env['res.company'].browse(vals['company_id'])
             for partner in self:
                 if partner.user_ids: