Hi @lorenzo. You don't need to set prefix => false in $defaults. In fact, if you did that and you actually were using the ":prefix" route parameter the value would have no affect - it would be overridden just as with all other defaults that also have route parameters. Conversely if you provide any key in defaults that does not have a route parameter, including well known route keys such as  "action", they are just passed straight through. There used to be an exception to this for "prefix" key in defaults with a false value. The test I modified here tested that exception. But this is no longer the case, and I updated the test to show that.