diff --git a/tex.el b/tex.el
index 7bbd7a07a78..545d30f95e6 100644
--- a/tex.el
+++ b/tex.el

@@ -64,6 +64,7 @@

(declare-function comint-mode "ext:comint" nil)

(declare-function tex--prettify-symbols-compose-p "ext:tex-mode"

(start end match))

+(declare-function tex--xref-backend "ext:tex-mode" nil)

(declare-function gnuserv-start "ext:gnuserv"

(&optional leave-dead) t)

@@ -3871,6 +3872,10 @@ Not intended for direct use for user."

(add-function :override (local 'prettify-symbols-compose-predicate)

#'TeX--prettify-symbols-compose-p)

+ ;; Activate new xref backend introduced in Emacs 31:

+ (when (>= emacs-major-version 31)

+ (add-hook 'xref-backend-functions #'tex--xref-backend nil t))

+

;; Standard Emacs completion-at-point support

(add-hook 'completion-at-point-functions

#'TeX--completion-at-point nil t)