DC connector has one fat leg

I would have thought the DC connecter would just go straight in the holes but, it seems to have one fat leg. Should I file it to fit?
Cheers to everyone that has helped up to now.

you can file it… i sometimes squeez them a bit, it works too

Cheers. Thanks for people replying so quickly. This is my first solder project kit other than circuit bent Casio SK1s and a £5 VU meter kit to get my soldering and resistor recognition skills back.