The incident occurred around 3:45 a.m. Saturday inside the Danny's Midnight Confessions on the 100 block of South 13th Street.
View the surveillance video here
Two workers were inside the store when a man entered.
He reportedly made a negative comment about merchandise in the store and left.
A short time later the man returned, pulling out silver handgun.
A struggle ensued with one of the workers and police say the suspect fired his gun, striking the 31-year-old employee in the back.
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The victim was taken to Jefferson Hospital in stable condition.
The man fled the store.
He is described as a black male, dark complexion, 5'7"-5'9" tall, with a thin build. He was last seen wearing glasses and a dark colored hooded sweatshirt with USA on the front.
Anyone with information is urged to contact Philadelphia Police at 215-686-TIPS (8477), text a tip to PPD TIP (7738847) or online at www.phillypolice.com. All tips will be confidential.