diff --git a/lisp/org-agenda.el b/lisp/org-agenda.el
index 6391e0e9c..f07c86b9a 100644
--- a/lisp/org-agenda.el
+++ b/lisp/org-agenda.el
@@ -5135,6 +5135,7 @@ of what a project is and how to check if it stuck, customize the variable
 	  (cons 'org-diary-default-entry diary-list-entries-hook))
 	 (diary-file-name-prefix nil) ; turn this feature off
 	 (diary-modify-entry-list-string-function 'org-modify-diary-entry-string)
+	 (diary-time-regexp (concat "^" diary-time-regexp))
 	 entries
 	 (org-disable-agenda-to-diary t))
     (save-excursion