Cape Town - The Kings have slipped to their 14th straight PRO14 defeat after going down 26-12 to Ospreys on Friday night.
The men from Port Elizabeth were much improved and had threatened to cause an upset after leading 12-7 at half time, but ill-discipline in the second half saw them concede two penalty tries as Ospreys wrestled back the momentum.
The Kings have conceded a bonus point in every match that they have played away from home this season.
The result leaves the Kings rock bottom of Conference B.
Their next match will be against Leinster, also away from home, next week Saturday.
Ospreys 26 (7)
Tries: Tom Habberfield, penalty try (2), Jeff Hassler
Conversion: Sam Davies
Kings 12 (12)
Tries: Michael Makase, Michael Willemse
Conversion: Martin du Toit