diff --git a/lisp/progmodes/perl-mode.el b/lisp/progmodes/perl-mode.el
index e5c8215faf3..01ac8584e19 100644
--- a/lisp/progmodes/perl-mode.el
+++ b/lisp/progmodes/perl-mode.el
@@ -160,6 +160,7 @@
 
 (defcustom perl-prettify-symbols t
   "If non-nil, some symbols will be displayed using Unicode chars."
+  :version "24.4"
   :type 'boolean)
 
 (defconst perl--prettify-symbols-alist