A college professor offered to keep an eye on his student’s children while she was taking her finals when her babysitter cancelled at the last minute, and a photo of the babysitting professor has gone viral.

Daniel Krebs of the University of Louisville was photographed playing computer games in the hallway outside his classroom with junior Monica Romero 4-year-old son, Marcus, and 5-year-old daughter, Mikayla. Willard told ABC News she tried to get her kids to sit quietly on the couch before Krebs intervened. The single mother said there are no military bases by U of L so the day care centers nearby aren’t open at a time that works for her schedule.

The 28-year-old ROTC student said her U.S. military history professor’s act of kindness caught her by surprise, but Krebs insists it was just “common sense.”

“A person like Monica, she’s a non-commissioned officer going to school, she’s a mom of two kids. I mean that’s the kind of thing that’s really impressive,” Krebs told ABC News. “Me handling her kids for 40, 45 minutes, that’s not impressive.”