Str8 is raised on river - what now?

[Beck]

Seat 1: jonbzzzz
Seat 3: AceKing83
Seat 4: southga
Seat 5: johnnyblaze2
Seat 6: LittleMoe1
Seat 7: hug2go
Seat 8: Patchmaster
Seat 10: Hero [ 8D,9H ]
ANTES/BLINDS
Patchmaster posts blind ($1), Hero posts blind ($2).

PRE-FLOP
jonbzzzz folds, AceKing83 folds, southga folds, johnnyblaze2 calls $2, LittleMoe1 folds, hug2go folds, Patchmaster folds, Hero checks.

FLOP [board cards 6H,KS,7C ]
Hero bets $2, johnnyblaze2 calls $2.

TURN [board cards 6H,KS,7C,10C ]
Hero bets $4, johnnyblaze2 calls $4.

RIVER [board cards 6H,KS,7C,10C,9C ]
Hero bets $4, johnnyblaze2 bets $8, Hero ???
Re-raise the river, or give him credit for the flush?

[ihardlyknowher]

I would just call the river raise. He is not going pay off your 3-bet unless he has you beat.