PVS-Studio warning V588 for TPP

int main(int argc, char **argv)
{
  ...
  ii=0;
  for (i=0; pEnvironment.szPeptide[i]!=0; i++)
    ii =+ pEnvironment.szPeptide[i];
  ...
}

This is what should have been written here: ii += pEnvironment.szPeptide[i];

This suspicious code was found in TPP project by PVS-Studio static code analyzer.
Warning message is:
V588 The expression of the 'A =+ B' kind is utilized. Consider reviewing it, as it is possible that 'A += B' was meant. plot_msms plot-msms1.cxx 478

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/