diff --git a/ChangeLog b/ChangeLog
index f78d1e2a6d..860c76e448 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Jun 19 11:59:56 2012  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* ext/readline/readline.c (Init_readline): don't set 0 to
+	  rl_catch_signals and rl_catch_sigwinch. [Bug #5423]
+
 Tue Jun 19 11:52:59 2012  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* ext/readline/readline.c (readline_s_get_special_prefixes): suppress
diff --git a/ext/readline/readline.c b/ext/readline/readline.c
index 97b13b64d9..622ea8c615 100644
--- a/ext/readline/readline.c
+++ b/ext/readline/readline.c
@@ -1885,12 +1885,6 @@ Init_readline()
 #if defined(HAVE_RL_PRE_INPUT_HOOK)
     rl_pre_input_hook = (Function *)readline_pre_input_hook;
 #endif
-#ifdef HAVE_RL_CATCH_SIGNALS
-    rl_catch_signals = 0;
-#endif
-#ifdef HAVE_RL_CATCH_SIGWINCH
-    rl_catch_sigwinch = 0;
-#endif
 #ifdef HAVE_RL_CLEAR_SIGNALS
     rl_clear_signals();
 #endif