diff --git a/lisp/ffap.el b/lisp/ffap.el
index b2b681b7c44..9fd753fc0e5 100644
--- a/lisp/ffap.el
+++ b/lisp/ffap.el
@@ -751,8 +751,10 @@ This uses `ffap-file-exists-string', which may try adding suffixes from
     ("\\.\\([chCH]\\|cc\\|hh\\)\\'" . ffap-c-mode) ; stdio.h
     (fortran-mode . ffap-fortran-mode)
     ("\\.[fF]\\'" . ffap-fortran-mode)
-    (tex-mode . ffap-tex-mode)		; search ffap-tex-path
+    (plain-tex-mode . ffap-tex-mode)    ; search ffap-tex-path
     (latex-mode . ffap-latex-mode)	; similar
+    (plain-TeX-mode . ffap-tex-mode)    ; AUCTeX v14 counterpart
+    (LaTeX-mode . ffap-latex-mode)      ; ditto
     ("\\.\\(tex\\|sty\\|doc\\|cls\\)\\'" . ffap-tex)
     ("\\.bib\\'" . ffap-bib)		; search ffap-bib-path
     ("\\`\\." . ffap-home)		; .emacs, .bashrc, .profile
@@ -1064,7 +1066,10 @@ If a given RFC isn't in these then `ffap-rfc-path' is offered."
     (math-mode ",-:$+<>@-Z_[:lower:]~`" "<" "@>;.,!?`:")
     ;; (La)TeX: don't allow braces
     (latex-mode "--:\\\\$+<>@-Z_[:alpha:]~*?" "<@" "@>;.,!:")
-    (tex-mode "--:\\\\$+<>@-Z_[:alpha:]~*?" "<@" "@>;.,!:")
+    (plain-tex-mode "--:\\\\$+<>@-Z_[:alpha:]~*?" "<@" "@>;.,!:")
+    ;; AUCTeX v14 counterparts:
+    (LaTeX-mode "--:\\\\$+<>@-Z_[:alpha:]~*?" "<@" "@>;.,!:")
+    (plain-TeX-mode "--:\\\\$+<>@-Z_[:alpha:]~*?" "<@" "@>;.,!:")
     ;; XML: don't allow angle brackets
     (xml-mode "--:\\\\${}+@-Z_[:alpha:]~*?#" "{<@" "@>;.,!:}")
     (nxml-mode "--:\\\\${}+@-Z_[:alpha:]~*?#" "{<@" "@>;.,!:}")