diff --git a/mu4e/mu4e-obsolete.el b/mu4e/mu4e-obsolete.el
index a85f61cc..e8067273 100644
--- a/mu4e/mu4e-obsolete.el
+++ b/mu4e/mu4e-obsolete.el
@@ -268,9 +268,9 @@
 (make-obsolete-variable 'mu4e-compose-dont-reply-to-self
                         "message-dont-reply-to-names"
                         "1.11.24")
-
 ;; calendar
-(define-obsolete-function-alias 'mu4e-icalendar-setup #'ignore '"1.11.22")
+(define-obsolete-function-alias 'mu4e-icalendar-setup
+  'gnus-icalendar-setup '"1.11.22")
 
 ;; mu4e.
 (make-obsolete 'mu4e-clear-caches "No longer used" "1.11.15")