new tab in bash on Arch Linux starts at home directory

On my Arch box, when I hit Ctrl+Alt+T bash opens a new tab in the Terminal's window. The pwd of this new tab is the current user's home directory. On my Ubuntu box at work however, the pwd of the new tab is the same pwd of the old tab. How can I tell bash on my Arch box to behave like bash on my Ubuntu box? Is it even a bash thing, or does Ubuntu include a customized variant of bash?