Real Madrid had taken the lead thanks to a fine strike from Karim Benzema in the first half.
'Los Blacnos' had had other chances to extend their lead since then but weren't quite able to take them, and needed another moment of Benzema magic.
The Frenchman got the ball on the right side of the box and weaved his way past two Celta defenders and got a shot away which Sergio's foot diverted on to the post.
Cabral could do nothing to get out of the way, as the ball rebounded off the post, on to him, and then in to the empty net to make it 2-0 to the awy team.