diff --git a/ChangeLog b/ChangeLog
index eb1c6d47fd..1038a6acdf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Dec 18 16:12:13 2015  Koichi Sasada  <ko1@atdot.net>
+
+	* vm_core.h: define USE_LAZY_LOAD if it is not defined.
+
 Fri Dec 18 15:40:06 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/stringio/stringio.c (strio_unget_bytes): extract from
diff --git a/vm_core.h b/vm_core.h
index 89a242acc6..38fcc0c333 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -402,10 +402,8 @@ struct rb_iseq_struct {
     } aux;
 };
 
-#define USE_LAZY_LOAD 0
-
 #ifndef USE_LAZY_LOAD
-#define USE_LAZY_LOAD
+#define USE_LAZY_LOAD 0
 #endif
 
 #if USE_LAZY_LOAD