PVS-Studio warning V557 for OpenCOLLADA

struct short2
{
  short values[2];
  short2(short s1, short s2)
  {
    values[0] = s1;
    values[2] = s2;
  }
  ....
};

This suspicious code was found in OpenCOLLADA project by PVS-Studio static code analyzer.
Warning message is:
V557 Array overrun is possible. The '2' index is pointing beyond array bound. mayadmtypes.h 48

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/