diff --git a/website_seo_blog/data/website_blog_data.xml b/website_seo_blog/data/website_blog_data.xml
index 283e329..976d57e 100755
--- a/website_seo_blog/data/website_blog_data.xml
+++ b/website_seo_blog/data/website_blog_data.xml
@@ -5,6 +5,7 @@
     <!-- Add seo url to all existing blogs and blog posts, its needed for existing databases, we don't update the url fields of the website blog records "menu_news" 
       and "action_open_website" because a template reference is used here and we can't use the seo_url field in a dynamically way -->
     <function name="add_seo_url" model="blog.blog" />
+    <function name="add_seo_url" model="blog.tag" />
 
   </data>
 </openerp>
\ No newline at end of file
diff --git a/website_seo_blog/models/website_blog.py b/website_seo_blog/models/website_blog.py
index 2a7bd4b..0dc8ff5 100755
--- a/website_seo_blog/models/website_blog.py
+++ b/website_seo_blog/models/website_blog.py
@@ -195,6 +195,13 @@ def get_default_meta_robots(self):
         cfg = self.env['website.config.settings'].search([])
         return cfg and cfg[0].website_blog_tag_default_meta_robots or False
 
+    @api.model
+    def add_seo_url(self):
+        for tag in self.env['blog.tag'].search([('seo_url', '=', False)]):
+            tag.write({'seo_url': slug(tag)})
+
+        return True
+
 
 class Website(models.Model):
     _inherit = 'website'