Tabs are read as "Radio button" in VoiceOver

When enabling VoiceOver, and navigating to a tab (inside a QTabView), the tab is read out as a "Radio button". The correct behaviour is to read this as "Tab" or "Selected tab".

To reproduce this: run the tabdialog example in Qt, enable VoiceOver, and select a tab.

Correct behaviour: take an Apple made application, for example Mail.app, and open the preferences dialog. Under "Junk Mail" there is a tab group with "Junk Mail Behaviors" and "Blocked". Those are read out as "tab". Another example would be Terminal.app's preferences.