The present disclosure relates to a surgical fastener for attaching a prosthesis intended to repair a hernial defect of the abdominal wall, the prosthesis has at least two layers made of a biocompatible flexible material joined together at least one assembly zone, so as to define an internal space delimited by a substantially circular peripheral contour. The internal space is accessible to said surgical fastener that includes at least one body forming a reinforcing section that includes an open ring intended to extend substantially along at least one part of the substantially circular substantially circular peripheral contour. The open ring is connected to an attachment arm that extends substantially radially towards the inside and is intended to be anchored in the abdominal wall.
