diff --git a/org-ql.el b/org-ql.el
index 73eb9e7..b4d3db2 100644
--- a/org-ql.el
+++ b/org-ql.el
@@ -227,7 +227,7 @@ returns nil or non-nil."
       (`nil items)
       ((or 'date 'deadline 'scheduled 'todo 'priority 'random
            (guard (cl-loop for elem in sort
-                           always (memq elem '(date deadline scheduled todo priority 'random)))))
+                           always (memq elem '(date deadline scheduled todo priority random)))))
        ;; Default sorting functions
        (org-ql--sort-by items (-list sort)))
       ;; Sort by user-given comparator.