Unity2D Animation - How to rotate sprite clockwise(negative) without the sprite rotating counter clockwise?

I'm trying to animate my character walking. I want to have his one foot point downwards a bit when he takes a step this means rotating the sprite clockwise (negatively). when I try to go from one frame, where the foot is at its neutral rotation (0), to the downward rotation (-40~), when I play back the animation the foot rotates COUNTER-CLOCKWISE (positively) in order to get to the second frames rotation (-40~). Is there a way to prevent or solve this issue?

I've included a diagram that shows what I mean.