PVS-Studio warning V614 for OpenCOLLADA

void write(FILE* file) const
{
  fprintf(file,"%i %i %i %i ",
    sDivisionCount, tDivisionCount, uDivisionCount, pointCount);
  size_t size = pointCount*3;
  for(size_t i; i<size; ++i)
  {
    fprintf(file, "%f", points[i]);
    if(i+1<size) fprintf(file, " ");
  }
}

This suspicious code was found in OpenCOLLADA project by PVS-Studio static code analyzer.
Warning message is:
V614 Uninitialized variable 'i' used. mayadmtypes.h 1728

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/