diff --git a/grub-core/kern/emu/hostfs.c b/grub-core/kern/emu/hostfs.c
index cee70413d..cb532105e 100644
--- a/grub-core/kern/emu/hostfs.c
+++ b/grub-core/kern/emu/hostfs.c
@@ -173,6 +173,9 @@ grub_hostfs_label (grub_device_t device __attribute ((unused)),
   return GRUB_ERR_NONE;
 }
 
+#undef open
+#undef close
+
 static struct grub_fs grub_hostfs_fs =
   {
     .name = "hostfs",