According to officers the robbery happened around 5:30 near 12th and Vine Streets.
The victim says he was working on his truck, when he was approached by a man asking for a cigarette. The victim says as he was getting one out of the truck, the suspect pulled out a large knife and demanded money.
The suspect took the victim's wallet and ran from the scene. He was last seen wearing a black shirt and blue jeans.
Anyone with information about the robbery is asked to contact the Jasper Police Department.