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-rw-r--r--ext/socket/init.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/socket/init.c b/ext/socket/init.c
index 990f1a4d6b..696b62d82a 100644
--- a/ext/socket/init.c
+++ b/ext/socket/init.c
@@ -52,6 +52,7 @@ rsock_init_sock(VALUE sock, int fd)
if (!S_ISSOCK(sbuf.st_mode))
rb_raise(rb_eArgError, "not a socket file descriptor");
#else
+ rb_update_max_fd(fd);
if (!rb_w32_is_socket(fd))
rb_raise(rb_eArgError, "not a socket file descriptor");
#endif