The Blaugrana defender has admitted that he did foul his opponent, but has insisted that the offence took place outside of the box
Undiano Mallenco pointed to the spot after the Brazil international brought down Ronaldo just outside the box after 55 minutes of play, allowing Madrid to go 3-2 up.
Alves admitted that it was not an easy decision for the official but refused to blame Mallenco for his mistake.
"I did catch Ronaldo for the penalty, but I immediately realised it was outside the area," Alves told ESPN Brasil.
"It was a difficult decision for the referee, though. He has to make up his mind in a split-second.
"In the end, all that matters is that we got the full three points."
The right-back then went on to discuss Barcelona's title chances and insisted that they will continue to give their all right until the end of the season.
"It has been a difficult season for us because Real Madrid and Atletico have been in fine form.
"It's not easy when you don't have matters in your own hand, but I can assure you that we will fight right until the end to retain our title."
Barcelona currently sit third in the Liga table, trailing both Madrid sides by one point.