diff --git a/lisp/mail/rmailsum.el b/lisp/mail/rmailsum.el
index 57b611f7667..38688190c56 100644
--- a/lisp/mail/rmailsum.el
+++ b/lisp/mail/rmailsum.el
@@ -823,6 +823,7 @@ Search, the `unseen' attribute is restored.")
   (define-key rmail-summary-mode-map "h"      'rmail-summary)
   (define-key rmail-summary-mode-map "i"      'rmail-summary-input)
   (define-key rmail-summary-mode-map "j"      'rmail-summary-goto-msg)
+  (define-key rmail-summary-mode-map "\C-m"   'rmail-summary-goto-msg)
   (define-key rmail-summary-mode-map "k"      'rmail-summary-kill-label)
   (define-key rmail-summary-mode-map "l"      'rmail-summary-by-labels)
   (define-key rmail-summary-mode-map "\e\C-h" 'rmail-summary)