JaJuan Johnson laughed and shrugged.

No fouls in 31 minutes Saturday against Ball State?

"I think it just was how the game was being called," said Johnson, who had 16 points and eight rebounds in Purdue's 69-49 victory.

Three times this season, Johnson has been limited to 20 minutes or less because of foul trouble. That includes only 15 minutes in Purdue's comeback victory at Alabama one week before Ball State.

Johnson said he didn't watch more film before Ball State to try to figure out why he's been plagued with foul trouble. He said he doesn't want to change his approach much.

"I want to try to stay aggressive in going to the glass," he said. "A lot of my fouls from Alabama were crashing the glass, so I don't really want to stop doing that. It's just one of those things.

"It wasn't my night (Saturday to get fouls called), I guess."

Johnson averages 6.7 rebounds per game, up from his 5.6 per game average last season.