PVS-Studio warning V636 for FlightGear

bool FGAIAircraft::fpExecutable(time_t now) {
  double rand_exec_time = (rand() % 100) / 100;
  return (dt_count > (0.1+rand_exec_time)) &&
          (fp->isActive(now));
}

This suspicious code was found in FlightGear project by PVS-Studio static code analyzer.
Warning message is:
V636 The '(rand() % 100) / 100' expression was implicitly casted from 'int' type to 'double' type. Consider utilizing an explicit type cast to avoid the loss of a fractional part. An example: double A = (double)(X) / Y;. aiaircraft.cxx 780

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/