The Saddlers were heading for a 1-1 draw against Huddersfield in midweek before Mattis popped up with an 87th-minute winner to see off his former club.
Now Mattis is firmly focused on Saturday's visit of Carlisle.
He told the club's official website: "You see the negative statistics about games without a home win but, honestly, it doesn't affect you as players. But we know that our home form has to be better if we are to do anything in this league.
"We've got that first home win under our belts now and we've got to be aiming at going on an unbeaten run here at the Banks's. It's early days so a couple of results boosts you right up the table.
"We have got to make this place a fortress. We've got to make it hard for teams to come here and take points from us. This is our home and we've got to win more games here, simple as that."