diff --git a/ext/lxc/lxc.c b/ext/lxc/lxc.c
index 1551dfa..8f88c19 100644
--- a/ext/lxc/lxc.c
+++ b/ext/lxc/lxc.c
@@ -1726,8 +1726,10 @@ Init_lxc(void)
     LXC_CONTAINER_CONST(LXC_ATTACH_SET_PERSONALITY);
 
     /* clone: clone flags */
+    LXC_CONTAINER_CONST(LXC_CLONE_KEEPBDEVTYPE);
     LXC_CONTAINER_CONST(LXC_CLONE_KEEPMACADDR);
     LXC_CONTAINER_CONST(LXC_CLONE_KEEPNAME);
+    LXC_CONTAINER_CONST(LXC_CLONE_MAYBE_SNAPSHOT);
     LXC_CONTAINER_CONST(LXC_CLONE_SNAPSHOT);
 
     /* create: create flags */