Animate 2017 Rotate Continously Snippet

I have created a clock and used the Rotate Continuously snippet in HTML Canvas to rotate the hands of the clock.  The problem I am having is that the hands are increasing in speed and I need them a constant speed. Is there a way to use the snippet without having the speed increase?

Here is the snippet code:

this.addEventListener("tick",fl_RotateContinuously_2.bind(this));

     function fl_RotateContinuously_2(){

            this.hour.rotation+=1;

}