It happened at the restaurant at 129 West Chelten Avenue around 5:30 p.m. on Friday.
The victim was at the counter when two unknown men entered the restaurant and appeared to be waiting for service.
That's when one of the men knocked the victim down to the floor.
As the victim was down, one of the men took his wallet and both suspects fled on foot west on Chelten Avenue toward Knox Street.
The suspects are described as:
Suspect #1: Black male, 20 years-of-age, short hair, thin build, gray tank top, blue shorts, and blue sneakers.
Suspect #2: Black male, 20 years-of-age, short hair, white "T" shirt, light blue shorts, and black and white sneakers.
Anyone with information is asked to contact Philadelphia Police at 215-686-TIPS (8477) or through phillypolice.com.