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-rw-r--r--lisp/progmodes/prolog.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/progmodes/prolog.el b/lisp/progmodes/prolog.el
index 33d43cb3d5a..99df94d3805 100644
--- a/lisp/progmodes/prolog.el
+++ b/lisp/progmodes/prolog.el
@@ -2110,7 +2110,7 @@ Argument BOUND is a buffer position limiting searching."
(if (eq prolog-system 'mercury)
(list
(prolog-make-keywords-regexp prolog-mode-specificators-i t)
- 0 'font-lock-reference-face)))
+ 0 'font-lock-constant-face)))
(directives
(if (eq prolog-system 'mercury)
(list