diff --git a/addons/web/common/http.py b/addons/web/common/http.py
index e23a0431a7c..69220eec2d7 100644
--- a/addons/web/common/http.py
+++ b/addons/web/common/http.py
@@ -403,7 +403,7 @@ class Root(object):
         request.parameter_storage_class = werkzeug.datastructures.ImmutableDict
 
         if request.path == '/':
-            params = urllib.urlencode(dict(request.args, debug=''))
+            params = urllib.urlencode(request.args)
             return werkzeug.utils.redirect(self.root + '?' + params, 301)(
                 environ, start_response)
         elif request.path == '/mobile':