My uncle makes me uncomfortable

I only have to see him every once in a while but when I do I feel so uncomfortable around him. I’ll catch him starring at me and he tries to be around me. The times I’ve had to hug him, he hugs me tight and too close and just thinking about makes me sick to my stomach. Luckily him and my dad don’t get along so I’ll go hangout with my dad to try to get away from him. How do I make this stop?