1 files changed, 3 insertions, 1 deletions

diff --git a/lisp/progmodes/fortran.el b/lisp/progmodes/fortran.el
index f67d75a2aa6..8e9ef8277bc 100644
--- a/lisp/progmodes/fortran.el
+++ b/lisp/progmodes/fortran.el
@@ -243,7 +243,9 @@ This does fairly subdued highlighting.")
   "For consideration as a value of `fortran-font-lock-keywords'.
 This does a lot more highlighting.")
 
-(defconst fortran-font-lock-keywords fortran-font-lock-keywords-1
+(defvar fortran-font-lock-keywords (if font-lock-maximum-decoration
+                                         fortran-font-lock-keywords-2
+                                       fortran-font-lock-keywords-1)
   "Additional expressions to highlight in Fortran mode.")
 
 (defvar fortran-mode-map ()