diff --git a/lisp/hexl.el b/lisp/hexl.el
index e2768dc39ca..40096800d0e 100644
--- a/lisp/hexl.el
+++ b/lisp/hexl.el
@@ -831,7 +831,6 @@ Customize the variable `hexl-follow-ascii' to disable this feature."
   (define-key hexl-mode-map "\ej" 'hexl-goto-address)
   (define-key hexl-mode-map "\ek" 'undefined)
   (define-key hexl-mode-map "\el" 'undefined)
-  (define-key hexl-mode-map "\eo" 'undefined)
   (define-key hexl-mode-map "\eq" 'undefined)
   (define-key hexl-mode-map "\es" 'undefined)
   (define-key hexl-mode-map "\et" 'undefined)