diff --git a/ChangeLog b/ChangeLog
index b424092c9c..294074e2ff 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Dec  1 17:16:54 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* misc/ruby-electric.el (ruby-electric-curlies): use kill-region
+	  instead of interactive command delete-backward-char.
+
 Sat Dec  1 17:12:55 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* misc/inf-ruby.el (inferior-ruby-mode): fix the
diff --git a/misc/ruby-electric.el b/misc/ruby-electric.el
index c41593bb67..0a55681a6e 100644
--- a/misc/ruby-electric.el
+++ b/misc/ruby-electric.el
@@ -174,7 +174,7 @@ strings. Note that you must have Font Lock enabled."
              (if (eq last-command-event ?{)
                  (save-excursion
                    (when (not (char-equal ?\# (preceding-char)))
-                       (delete-backward-char)
+                       (kill-region (point) (1- (point)))
                        (insert "#"))))
              (save-excursion
                (backward-char 1)