diff --git a/ChangeLog b/ChangeLog
index f5841b62ba..614064e73a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Sep  7 05:06:16 2009  Koichi Sasada  <ko1@atdot.net>
+
+	* vm_insnhelper.c: rename macro name ENABLE_IC_FOR_IVAR
+	  to USE_IC_FOR_IVAR.
+
 Mon Sep  7 03:21:40 2009  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* lib/uri/common.rb (URI.escape): obsoleted.
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 8cec18d400..b00b2464dd 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -1183,14 +1183,14 @@ vm_get_cvar_base(NODE *cref)
 }
 
 
-#ifndef ENABLE_IC_FOR_IVAR
-#define ENABLE_IC_FOR_IVAR 1
+#ifndef USE_IC_FOR_IVAR
+#define USE_IC_FOR_IVAR 1
 #endif
 
 static VALUE
 vm_getivar(VALUE obj, ID id, IC ic)
 {
-#if ENABLE_IC_FOR_IVAR
+#if USE_IC_FOR_IVAR
     if (TYPE(obj) ==  T_OBJECT) {
 	VALUE val = Qundef;
 	VALUE klass = RBASIC(obj)->klass;
@@ -1237,7 +1237,7 @@ vm_getivar(VALUE obj, ID id, IC ic)
 static void
 vm_setivar(VALUE obj, ID id, VALUE val, IC ic)
 {
-#if ENABLE_IC_FOR_IVAR
+#if USE_IC_FOR_IVAR
     if (!OBJ_UNTRUSTED(obj) && rb_safe_level() >= 4) {
 	rb_raise(rb_eSecurityError, "Insecure: can't modify instance variable");
     }