Until recently I carried either a pocket knife in my pocket or a folding knife clipped on to my pants. Now I am carrying a fixed blade knife with a sheath that slips onto my belt.

I am having a hard time keeping the sheath from sliding back and forth on my belt as I move around. Since most of the sheaths I see for fixed blade knives come this way, I was wondering what others do to keep the sheath sliding around? Or is this how it is supposed to be?

Thanks!