QMessageBox::setStandardButtons shows duplicates buttons in Qt5.3 RC1 for Android

I use

QMessageBox licenceBox(this);
licenceBox.setStandardButtons(QMessageBox::Yes | QMessageBox::No);

to show a message dialog with one set of 'Yes' and 'No' buttons:

[Message Box Text]
YES, NO

On Android this gives me two sets of buttons showing as:

[Message Box Text]
YES, NO, YES, NO

Dialog works fine on desktop versions.