Issue with points

[kpezz]

I have a function that when a timer hits 10 sec to add 10,000 points to score, but when I play the movie keeps adding points over and over again. How can I stop this?
Thanks in Advance

Here is the code:

onClipEvent (enterFrame) {
if(_root.count_down==1001) {
        _root.count_down--;
        _root.score += 10000;
}
}