A rod seal assembly for a machine comprising a crosshead and a sealed oscillating piston rod, wherein the rod seal assembly comprises: a seal housing, a rod seal, a bushing and a rod seal base, wherein the rod seal, the bushing and the rod seal base are annular and can be laterally moved in relation to the seal housing the housing axially supports the rod seal base, the rod seal base is adapted to be arranged around the piston rod and is provided with a base portion, wherein the base portion comprises a lower axial surface directed in a first axial direction, an upper axial surface directed in a second axial direction, wherein the lower axial surface abuts the housing and the upper axial surface is provided with a rod seal seat, the rod seal is adapted to be arranged around the piston rod, and has a first end portion and a second end portion, wherein the first end portion is arranged to connect to the rod seal base in the first axial direction, and the bushing is arranged to abut the rod seal in the first axial direction, and the rod seal base and the bushing are arranged to have an axial overlap, an inner seal ring is arranged between lower axial surface of the base portion and the seal housing (300, 310, 110), characterized in that an outer seal ring is arranged between the lower axial surface of the base portion and the seal housing (300, 310, 110), wherein the outer seal ring is arranged radially outside the inner seal ring, and the lower surface of the base portion is provided with an annular slot defined by at least one radial inner wall at which the inner seal ring is arranged and an outer radial wall at which the outer seal ring is arranged, and the base portion further comprising a pressure relief channel arranged to connect the lower and the upper axial surfaces (113, 114) of the base portion. a seal housing, a rod seal, a bushing and a rod seal base, wherein the rod seal, the bushing and the rod seal base are annular and can be laterally moved in relation to the seal housing the housing axially supports the rod seal base, the rod seal base is adapted to be arranged around the piston rod and is provided with a base portion, wherein the base portion comprises a lower axial surface directed in a first axial direction, an upper axial surface directed in a second axial direction, wherein the lower axial surface abuts the housing and the upper axial surface is provided with a rod seal seat, the rod seal is adapted to be arranged around the piston rod, and has a first end portion and a second end portion, wherein the first end portion is arranged to connect to the rod seal base in the first axial direction, and the bushing is arranged to abut the rod seal in the first axial direction, the rod seal, the bushing and the rod seal base are annular and can be laterally moved in relation to the seal housing the housing axially supports the rod seal base, the rod seal base is adapted to be arranged around the piston rod and is provided with a base portion, wherein the base portion comprises a lower axial surface directed in a first axial direction, an upper axial surface directed in a second axial direction, wherein a lower axial surface directed in a first axial direction, an upper axial surface directed in a second axial direction, wherein the lower axial surface abuts the housing and the upper axial surface is provided with a rod seal seat, the rod seal is adapted to be arranged around the piston rod, and has a first end portion and a second end portion, wherein the first end portion is arranged to connect to the rod seal base in the first axial direction, and the bushing is arranged to abut the rod seal in the first axial direction, and the rod seal base and the bushing are arranged to have an axial overlap, an inner seal ring is arranged between lower axial surface of the base portion and the seal housing (300, 310, 110), characterized in that an outer seal ring is arranged between the lower axial surface of the base portion and the seal housing (300, 310, 110), wherein the outer seal ring is arranged radially outside the inner seal ring, and the lower surface of the base portion is provided with an annular slot defined by at least one radial inner wall at which the inner seal ring is arranged and an outer radial wall at which the outer seal ring is arranged, and the base portion further comprising a pressure relief channel arranged to connect the lower and the upper axial surfaces (113, 114) of the base portion.