Compilation fix.
Compilation fix.

Althiena/PolyEngine,PiotrMoscicki/PolyEngine,Althiena/PolyEngine,KNTGPolygon/PolyEngine,Althiena/PolyEngine,MuniuDev/PolyEngine,MuniuDev/PolyEngine,KNTGPolygon/PolyEngine,MuniuDev/PolyEngine,PiotrMoscicki/PolyEngine