1 files changed, 3 insertions, 1 deletions

diff --git a/lisp/font-lock.el b/lisp/font-lock.el
index 8cb43bc0bd8..052e92391af 100644
--- a/lisp/font-lock.el
+++ b/lisp/font-lock.el
@@ -1516,7 +1516,9 @@ Sets various variables using `font-lock-defaults' (or, if nil, using
     (make-local-variable 'font-lock-fontified)
     (make-local-variable 'font-lock-multiline)
     (let* ((defaults (or font-lock-defaults
-                         (cdr (assq major-mode font-lock-defaults-alist))))
+                         (cdr (assq major-mode
+                                    (with-no-warnings
+                                     font-lock-defaults-alist)))))
            (keywords
             (font-lock-choose-keywords (nth 0 defaults)
                                        (font-lock-value-in-major-mode font-lock-maximum-decoration)))