error: return-statement with a value, in function returning 'void' [-fpermissive]

[Magnes34]

error: return-statement with a value, in function returning 'void' [-fpermissive]What does this mean in reference to the code?

  void exit_program (void)
{
    cout << "Thank you and have a nice day.";

    return EXIT_SUCCESS;
}

[shadowCODE]

void means dont return anything .
yet you return EXIT_SUCCESS

  void exit_program (void)
{
    cout << "Thank you and have a nice day.";

    return ;  //Still means return nothing. Or beter still leave it empty
}