Lauren James came off the bench to help Chelsea defeat Arsenal 1-0 at Stamford Bridge.
As the clock ticked down in west London, it looked like the WSL leaders would lose for just the second time this season.
Catarina Macario had a frustrating afternoon in front of goal, but the Brazilian was not left to suffer the consequences of her misses.
Millie Bright and Lucy Bronze did a respectable job of containing the threat posed by England teammates Alessia Russo and Beth Mead, with defenses mostly in control.
With eight minutes left, James managed to entice Kim Little into a dangerous challenge inside the penalty area, and Guro Reiten showed no signs of nervousness as she rolled the following spot-kick into the bottom corner.