Walker was handed his first senior deal with the club last season, and, although stiff competition for places limited his first-team chances, coach Andrew Henderson was very impressed with the 20-year-old.
“Alex had to be patient last season as a player as there were a number of quality fullbacks in front of him. It was probably the only position that we had genuine strength in depth,” Henderson told the Broncos’ official website.
“With a large number of young players playing regular first team, Walker found it frustrating as he was keen for an opportunity.
“I told Alex he would have to be patient for his opportunity and I was really pleased for him when he got it against Dewsbury.
“The fact he took his chance and played well convinced me to continue our work with him in developing him into a future first team regular for us. I’m really pleased he has decided to stay.”
Walker himself is delighted to have committed his immediate future to the club where he came through the youth development pyramid.
“It was tough at times last season, I would see so many of my team mates playing and I just wanted to be out there to help them and show Hendo what I could offer,” he said.
“I’m really excited to be staying now and continuing my development at the Broncos. I love it here and its my home club.”