scaleX *= -1 only modifying width

programming flash
1 
if(guy.scaleX > 0)
                        {
                            guy.scaleX *= -1;
                            guy.x += 32.5;
                        }

-1, 1, -2, 2, etc… it only modifies my movieclips width, and does not do the desired effect, that being an image flipped horizontally. what could be the potential problem here?

thanks.