The Brisbane Broncos handed the South Sydney Rabbitohs their second straight defeat to all but lock in their playoffs spot last night.

The Broncos cruised to a 38-18 victory at Suncorp Stadium to leapfrog the Warriors into seventh place on the table.

Winger Corey Oates bagged a hat-trick as the Broncos scored three tries in the final 20 minutes to secure the win after the Rabbitohs came back from 18-0 to tie the game up after halftime.

The win puts the Broncos four points clear of the ninth placed West Tigers.

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"We were obviously good and had a few tough moments as well, but we stayed at it in the way that we know works for us," Broncos coach Wayne Bennett said after last night's victory.