After just over an hour, Gustav Ludwigson scored the ball from the left wing and Akinkunmi Amoo hit it.
AIK had a difficult time on the field; the muddy surface was clearly affecting his technique.
It is two months since AIK won away.
The closest equalizer for AIK was substitute Bojan Radulovic who in extra time had a shot over from a good position in the penalty area.
- It was so cool to win in front of our fans and give the team such an important victory.
It means so much, says Amoo to Discovery + while the fans' victory songs roll around the arena, which was packed.