diff --git a/local/lib/org-x/org-x.el b/local/lib/org-x/org-x.el
index c540c95..1d09d37 100644
--- a/local/lib/org-x/org-x.el
+++ b/local/lib/org-x/org-x.el
@@ -1980,7 +1980,7 @@ If ARG is non-nil use long timestamp format."
                      (org-ml-unixtime-to-time-short ut))
                 (org-ml-build-timestamp!)
                 (org-ml-to-string)
-                (org-ml-build-node-property org-x-prop-expire))))
+                (list org-x-prop-expire))))
       (org-ml-update-this-headline*
         (org-ml-headline-map-node-properties* (cons np it) it)))))
 
@@ -1988,7 +1988,7 @@ If ARG is non-nil use long timestamp format."
   "Set days-to-live of the current headline."
   (interactive)
   (let ((np (->> (org-x--read-number-from-minibuffer "Days to live" t)
-              (org-ml-build-node-property org-x-prop-days-to-live))))
+                 (list org-x-prop-days-to-live))))
     (org-ml-update-this-headline*
       (org-ml-headline-map-node-properties* (cons np it) it))))