diff --git a/addons/web/static/src/js/corelib.js b/addons/web/static/src/js/corelib.js
index 1a32a4b4b6e..116ddf2e8c2 100644
--- a/addons/web/static/src/js/corelib.js
+++ b/addons/web/static/src/js/corelib.js
@@ -1144,7 +1144,7 @@ instance.web.JsonRPC = instance.web.Class.extend(instance.web.PropertiesMixin, {
             }
             qs = '?' + $.param(params);
         }
-        var prefix = _.any(['http://', 'https://', '//'], _.bind(_.str.startsWith, null, path)) ? '' : self.prefix; 
+        var prefix = _.any(['http://', 'https://', '//'], _.bind(_.str.startsWith, null, path)) ? '' : this.prefix; 
         return prefix + path + qs;
     },
 });