diff --git a/addons/web/static/src/js/corelib.js b/addons/web/static/src/js/corelib.js
index 21d593069e7..7a9af79b4fb 100644
--- a/addons/web/static/src/js/corelib.js
+++ b/addons/web/static/src/js/corelib.js
@@ -122,7 +122,7 @@ openerp.web.corelib = function(instance) {
         // The dummy class constructor
         function Class() {
             if(this.constructor !== instance.web.Class){
-                throw new Error("You need a 'new' to instanciate an object");
+                throw new Error("You can only instanciate objects with the 'new' operator");
                 return null;
             }
             // All construction is actually done in the init method