1 files changed, 3 insertions, 0 deletions

diff --git a/io.c b/io.c
index 0be6b24a6f..4f98031c40 100644
--- a/io.c
+++ b/io.c
@@ -204,6 +204,9 @@ rb_update_max_fd(int fd)
     }
 }
 
+#undef HAVE_FCNTL
+#undef O_CLOEXEC
+
 void
 rb_maygvl_fd_fix_cloexec(int fd)
 {