In an online game this is as it should be and can not be changed.
OTB it is also in the rules that you lose in time, BUT atleast in my country mate on board rules over time loss, so even if your time is out, just move and checkmate and say "mate on board" and it's your win.
OTB it is also in the rules that you lose in time, BUT atleast in my country mate on board rules over time loss, so even if your time is out, just move and checkmate and say "mate on board" and it's your win.