* lisp/autorevert.el (auto-revert-avoid-polling): Fix :set form.

diff --git a/lisp/autorevert.el b/lisp/autorevert.el
index 6f5ca75ddf8a02699ac95cddebc89c145a9205e3..cdd8223fffddc601a3ce15ecf8b9bc954cfecc6f 100644 (file)
--- a/lisp/autorevert.el
+++ b/lisp/autorevert.el
@@ -322,7 +322,8 @@ the value of this variable."
   :type 'boolean
   :set (lambda (variable value)
          (set-default variable value)
-         (auto-revert-set-timer))
+        (when (fboundp 'auto-revert-set-timer)
+           (auto-revert-set-timer)))
   :version "27.1")
 
 ;; Internal variables: