# Any issues if I declare the same event listener twice?

**URL:** <https://forum.kirupa.com/t/any-issues-if-i-declare-the-same-event-listener-twice/301765>\
**Category:** Uncategorized\
**Created:** [December 15, 2009, 9:35am UTC](https://forum.kirupa.com/t/any-issues-if-i-declare-the-same-event-listener-twice/301765 "2009-12-15T09:35:08Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Shaedo](https://avatars.discourse-cdn.com/v4/letter/s/e19b73/32.png) [@Shaedo](https://forum.kirupa.com/u/Shaedo)\
**Post date:** [December 15, 2009, 9:35am UTC](https://forum.kirupa.com/t/any-issues-if-i-declare-the-same-event-listener-twice/301765/1 "2009-12-15T09:35:08Z")

</div>

for example if I was to do

```auto
A();
B();
function A():void
{
this.addEventListener(MouseEvent.MOUSE_DOWN,MD,false,0,true);
}
function B():void
{
this.addEventListener(MouseEvent.MOUSE_DOWN,MD,false,0,true);
}

```

I know a removeEventListener will removes them both, so I am guessing that in reality I have only one listener taking up system resources?