A surgical stapling device comprising: an adaptor assembly having a proximal end portion and a distal end portion; and a reload assembly supported on the distal end portion of the adaptor assembly, the reload assembly including: a shell housing including an outer housing portion and an inner housing portion, the inner and outer housing portions defining an annular cavity; a staple cartridge supporting a plurality of staples; a staple pusher supported within the annular cavity and movable from a retracted position to an advanced position to eject staples from the staple cartridge; a staple actuator supported within the annular cavity and having a stop surface, the staple actuator positioned to engage the staple pusher and movable from a retracted position to an advanced position to move the staple pusher from its retracted position to its advanced position, the staple actuator and the staple pusher defining a through bore; a knife carrier (114, 114') supported within the through bore and movable between a retracted position and an advanced position, the knife carrier defining a longitudinal axis; and a knife supported on the knife carrier (114, 114'), characterised in that the knife carrier (114, 114') supports a resilient locking member (180, 180') the resilient locking member being aligned with the stop surface on the staple actuator when the staple actuator is in its advanced position and the knife carrier is in its retracted position to prevent readvancement of the knife carrier. an adaptor assembly having a proximal end portion and a distal end portion; and a reload assembly supported on the distal end portion of the adaptor assembly, the reload assembly including: a shell housing including an outer housing portion and an inner housing portion, the inner and outer housing portions defining an annular cavity; a staple cartridge supporting a plurality of staples; a staple pusher supported within the annular cavity and movable from a retracted position to an advanced position to eject staples from the staple cartridge; a staple actuator supported within the annular cavity and having a stop surface, the staple actuator positioned to engage the staple pusher and movable from a retracted position to an advanced position to move the staple pusher from its retracted position to its advanced position, the staple actuator and the staple pusher defining a through bore; a knife carrier (114, 114') supported within the through bore and movable between a retracted position and an advanced position, the knife carrier defining a longitudinal axis; and a knife supported on the knife carrier (114, 114'), characterised in that the knife carrier (114, 114') supports a resilient locking member (180, 180') the resilient locking member being aligned with the stop surface on the staple actuator when the staple actuator is in its advanced position and the knife carrier is in its retracted position to prevent readvancement of the knife carrier. a shell housing including an outer housing portion and an inner housing portion, the inner and outer housing portions defining an annular cavity; a staple cartridge supporting a plurality of staples; a staple pusher supported within the annular cavity and movable from a retracted position to an advanced position to eject staples from the staple cartridge; a staple actuator supported within the annular cavity and having a stop surface, the staple actuator positioned to engage the staple pusher and movable from a retracted position to an advanced position to move the staple pusher from its retracted position to its advanced position, the staple actuator and the staple pusher defining a through bore; a knife carrier (114, 114') supported within the through bore and movable between a retracted position and an advanced position, the knife carrier defining a longitudinal axis; and a knife supported on the knife carrier (114, 114'), characterised in that the knife carrier (114, 114') supports a resilient locking member (180, 180') the resilient locking member being aligned with the stop surface on the staple actuator when the staple actuator is in its advanced position and the knife carrier is in its retracted position to prevent readvancement of the knife carrier.