Pagetitle of the Form Confirmation Dialog


I have several pages with forms. After submitting the form the Form Confirmation Dialog (FCD) is shown. I have added our Google Tag Manager container (with Google Analytics in it) in the script manager of the FCD. In Google Analytics I see the FCD as a pageview (shows as /pagepath/b-form_confirmation.html). This page does not have a page title and therefor shows up as (not set).

Anyone an idea how to show a Pagetitle that is set by myself?