How To Keep Formula Cell Reference Constant ?

Whenever i add a new row the cell reference goes down, for example:

In this formula:

=AVERAGEIF($O$10:O576;">0";$O$10:$O$576)

after adding a new row it becomes

=AVERAGEIF($O$11:O576;">0";$O$11:$O$576)

and so on,

How to keep formula cell reference constant?

I forget to mention the row is added at the top, so after a new row is added the cell reference goes down.

It worked ,

Thank you