QTabBar stylesheet property "alignment" not working

Hi, I'm trying to display a QTabBar where the tabs are right-aligned instead of the platform default (left).

I put the following in my mainwindow.cpp after the call to ui->setupUi():

ui>tabBar>setExpanding(false);
ui>tabBar>setStyleSheet("QTabBar{alignment:right;}");

However, instead of aligning the tabs to the right, they are now centered. It turns out they are always centered when I apply a stylesheet with an alignment property, no matter if I set "alignment: left", "alignment: center" or "alignment: right".

Am I doing anything wrong or doesn't QTabBar properly support the alignment property?