Mouse scroll accelerate not working

Hi,

On my Macbook Pro, it used to be that when I used my mouse to scroll, initially it would scroll very little. If you scrolled faster, then you would scroll a lot more, just like the touchbad. Now, however, the mouse scroll speed appears to be fixed and not accelerate at all.

I used, the following command, which shows 5:

defaults read .GlobalPreferences com.apple.scrollwheel.scaling

How can I get it back to default?