A Porter Avenue man foiled a gunpoint robbery in Prospect Park late Monday night by reaching into his book bag, pulling out a large radio and throwing it at his assailant’s head, Central District police reported Tuesday.

The victim told police he was walking west on Connecticut Street, shortly after 11 p.m., when he cut through a convenience-store parking lot on Prospect Avenue. The would-be thief left the store, followed him into the park, pointed a gray handgun at him, punched him in the face and threw him onto the ground, police said.

When the assailant asked for the man’s wallet, the victim pulled out the radio and struck him with it. The suspect fled on foot, while the victim was taken to Sisters Hospital after complaining of dizziness and pain on the left side of his face.

The complainant described his attacker as a black male, about 5 foot 10 and 200 pounds, in his late teens to early 20s, wearing a green T-shirt, a gray hooded sweatshirt with black shoulders, blue jeans and blue sneakers with red laces, police reported.