The BP Station on Highway 17 in Livingston was robbed Monday around 10:00 p.m.
Police say the suspect allegedly asked for change and then pulled a handgun on the clerk.
The suspect is described as a white male about 5'9" tall, between 150 and 190 pounds, with brown hair.
At the time, he was wearing a white t-shirt with a rebel flag emblem, denim shorts and sandals.
Anyone with information on the case is asked to call Livingston Police at (205) 652-9525.