The invention relates to an actuator 1 suitable for a pedestrian safety hood lifting arrangement comprising a housing 2, a piston 5 and a sealing 8. The sealing 8 is located at the second end 4 of the cylinder 2 and seals a space between the piston 5 at its second end 7 and the housing 2 such that moisture, dirt or other particles are prevented from entering into the cylinder. An opening 14 provided with edges 15 in the second end 4 of the cylinder allows the piston to move and extend out of the cylinder when the actuator 1 is activated. The piston 5 is designed such that the piston rod 12 may easily pass through the opening 14 while the piston base 13, which has a larger cross sectional area, will not pass through the opening 14. The invention is characterized in that the sealing 8 comprises an anchoring portion 10 which is located between the housing 2 and the piston 5 and thereby forms a seal between the piston 5 and the housing 2 at the second end 4 of the housing. The invention further relates to hood lifting arrangement comprising such an actuator as described above and the use of such an actuator in a hood lifting arrangement.