An apparatus for joining two hollow organ sections includes a staple cartridge assembly including an annular wall, an anvil assembly, a buttress member, and a fastening member. The annular wall of the staple cartridge assembly defines an inner aperture in an inner surface thereof and an outer aperture in an outer surface thereof. The buttress member is configured to be positioned on a distal surface of the staple cartridge assembly. The buttress member defines a cutout on a peripheral portion thereof. The fastening member has a first end securely affixed to the inner aperture of the annular wall of the staple cartridge assembly and a second end securely affixed to the outer aperture of the annular wall of the staple cartridge assembly to secure the buttress member on the staple cartridge assembly. The cutout of the buttress member is in registration with the outer aperture of the annular wall.
