diff --git a/odoo/http.py b/odoo/http.py
index c6020fe6294..62551947865 100644
--- a/odoo/http.py
+++ b/odoo/http.py
@@ -578,6 +578,7 @@ class JsonRequest(WebRequest):
         super(JsonRequest, self).__init__(*args)
 
         self.jsonp_handler = None
+        self.params = {}
 
         args = self.httprequest.args
         jsonp = args.get('jsonp')