diff --git a/ext/readline/readline.c b/ext/readline/readline.c
index 198f0e6..d6fb631 100644
--- a/ext/readline/readline.c
+++ b/ext/readline/readline.c
@@ -1495,6 +1495,16 @@ Init_readline()
     /* Allow conditional parsing of the ~/.inputrc file. */
     rl_readline_name = (char *)"Ruby";
 
+#if defined HAVE_RL_GETC_FUNCTION
+    /* libedit check rl_getc_function only when rl_initialize() is called, */
+    /* and using_history() call rl_initialize(). */
+    /* This assignment should be placed before using_history() */
+    rl_getc_function = readline_getc;
+    id_getbyte = rb_intern_const("getbyte");
+#elif defined HAVE_RL_EVENT_HOOK
+    rl_event_hook = readline_event;
+#endif
+
     using_history();
 
     completion_proc = rb_intern(COMPLETION_PROC);
@@ -1640,12 +1650,6 @@ Init_readline()
     rb_define_const(mReadline, "VERSION", version);
 
     rl_attempted_completion_function = readline_attempted_completion_function;
-#if defined HAVE_RL_GETC_FUNCTION
-    rl_getc_function = readline_getc;
-    id_getbyte = rb_intern_const("getbyte");
-#elif defined HAVE_RL_EVENT_HOOK
-    rl_event_hook = readline_event;
-#endif
 #ifdef HAVE_RL_CATCH_SIGNALS
     rl_catch_signals = 0;
 #endif