In some examples, a scroll pump 10 may include two scrolls, which are co-operable for pumping fluid from an inlet to an outlet on relative orbiting motion of the scrolls. Each scroll may include a respective scroll base from which a respective scroll wall extends generally axially towards the base of the opposing scroll. At least a first portion of one or each of the respective scroll walls has formed in an axial end face thereof a plurality of pockets distributed along the first portion for disrupting leakage of fluid from a high pressure side of the scroll wall to a low pressure side of the scroll wall.