diff --git a/ext/socket/socket.c b/ext/socket/socket.c
index 38911c46d7..5f4fe6abe8 100644
--- a/ext/socket/socket.c
+++ b/ext/socket/socket.c
@@ -2785,9 +2785,8 @@ sock_accept_nonblock(sock)
     GetOpenFile(sock, fptr);
     rb_io_set_nonblock(fptr);
     fd2 = accept(fptr->fd, (struct sockaddr*)buf, &len);
-
     if (fd2 < 0) {
-        rb_sys_fail(0);
+        rb_sys_fail("accept(2)");
     }
     sock2 = init_sock(rb_obj_alloc(rb_cSocket), fd2);