1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/subr.el b/lisp/subr.el
index b84e8ffc89b..65a22d1f116 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -612,7 +612,7 @@ function, it is changed to a list of functions."
   (if (or local
           ;; Detect the case where make-local-variable was used on a hook
           ;; and do what we used to do.
-          (and (local-variable-p hook)
+          (and (local-variable-if-set-p hook)
                (not (memq t (symbol-value hook)))))
       ;; Alter the local value only.
       (or (if (consp function)