diff --git a/site-lisp/db-org.el b/site-lisp/db-org.el
index e594dea..1c27ad0 100644
--- a/site-lisp/db-org.el
+++ b/site-lisp/db-org.el
@@ -845,6 +845,9 @@ This is done only if the value of this variable is not null."
           ;; actual export; calls `org-release-buffers’ and may thus close
           ;; buffers we want to keep around … which is why we set
           ;; `org-agenda-new-buffers’ to nil
+          (when (file-exists-p org-icalendar-combined-agenda-file)
+            (delete-file org-icalendar-combined-agenda-file)
+            (sit-for 3))
           (org-icalendar-combine-agenda-files)
           (message "Exporting diary ... done.")))))))