diff --git a/addons/website/models/res_config.py b/addons/website/models/res_config.py
index 1a85d66bd35..848b96f76c6 100644
--- a/addons/website/models/res_config.py
+++ b/addons/website/models/res_config.py
@@ -10,7 +10,7 @@ class website_config_settings(osv.osv_memory):
         'website_name': fields.related('website_id', 'name', type="char", string="Website Name"),
 
         'language_ids': fields.related('website_id', 'language_ids', type='many2many', relation='res.lang', string='Languages'),
-        'default_lang_id': fields.related('website_id', 'default_lang_id', type='many2one', relation='res.lang', string='Default language'),
+        'default_lang_id': fields.related('website_id', 'default_lang_id', type='many2one', relation='res.lang', string='Default language', required=True),
         'default_lang_code': fields.related('website_id', 'default_lang_code', type="char", string="Default language code"),
         'google_analytics_key': fields.related('website_id', 'google_analytics_key', type="char", string='Google Analytics Key'),
         
diff --git a/addons/website/models/website.py b/addons/website/models/website.py
index deb9eecce9c..03cce6fe927 100644
--- a/addons/website/models/website.py
+++ b/addons/website/models/website.py
@@ -154,7 +154,7 @@ class website(osv.osv):
         'name': fields.char('Domain'),
         'company_id': fields.many2one('res.company', string="Company"),
         'language_ids': fields.many2many('res.lang', 'website_lang_rel', 'website_id', 'lang_id', 'Languages'),
-        'default_lang_id': fields.many2one('res.lang', string="Default language"),
+        'default_lang_id': fields.many2one('res.lang', string="Default language", required=True),
         'default_lang_code': fields.related('default_lang_id', 'code', type="char", string="Default language code", store=True),
         'social_twitter': fields.char('Twitter Account'),
         'social_facebook': fields.char('Facebook Account'),