diff --git a/addons/website/controllers/main.py b/addons/website/controllers/main.py
index 94bfd5f0d6d..af6554f483c 100644
--- a/addons/website/controllers/main.py
+++ b/addons/website/controllers/main.py
@@ -43,7 +43,8 @@ class QueryURL(object):
         self.path_args = OrderedSet(path_args or [])
 
     def __call__(self, path=None, path_args=None, **kw):
-        path = path or self.path
+        path_prefix = path or self.path
+        path = ''
         for key, value in self.args.items():
             kw.setdefault(key, value)
         path_args = OrderedSet(path_args or []) | self.path_args
@@ -65,6 +66,8 @@ class QueryURL(object):
                 path += '/' + key + '/' + value
         if fragments:
             path += '?' + '&'.join(fragments)
+        if not path.startswith(path_prefix):
+            path = path_prefix + path
         return path
 
 
diff --git a/addons/website_blog/controllers/main.py b/addons/website_blog/controllers/main.py
index 5a03b067282..902eee77535 100644
--- a/addons/website_blog/controllers/main.py
+++ b/addons/website_blog/controllers/main.py
@@ -215,9 +215,7 @@ class WebsiteBlog(http.Controller):
 
         if blog:
             values['main_object'] = blog
-            values['blog_url'] = QueryURL('', ['blog', 'tag'], blog=blog, tag=tag, date_begin=date_begin, date_end=date_end, search=search)
-        else:
-            values['blog_url'] = QueryURL('/blog', ['tag'], date_begin=date_begin, date_end=date_end, search=search)
+        values['blog_url'] = QueryURL('/blog', ['blog', 'tag'], blog=blog, tag=tag, date_begin=date_begin, date_end=date_end, search=search)
 
         return request.render("website_blog.blog_post_short", values)