How to disable tap-to-click for the trackpad

I'm using a desktop with a wireless keyboard. This keyboard has a built in trackpad, similar to what you'll see on a laptop.
I would like to disable the tap-to-click feature because it's very sensitive and clicks frequently occur unintentionally.
Accessing the Mouse and Trackpad applet in the Control Panel, I was unable to locate any option to disable tap-to-click.

Can anyone point me to where i can disable the tap-to-click feature for the trackpad? Any help would be appreciated.

~tronovan