How to increase the serial console width?

So, whenever i connect to the serial console with minicom from another linux system, the width of the terminal gets small. As if it has a fixed number of columns, is it possible to change this? I’m using @frank-w’s kernel/image.

Is agetty the binary responsible for it? I see this line on ps:

/sbin/agetty -o -p -- \u --keep-baud 115200,57600,38400,9600 - vt220

On the service file:

ExecStart=-/sbin/agetty -o '-p -- \\u' --keep-baud 115200,57600,38400,9600 - $TERM

Do i need to change the $TERM variable or something?