diff --git a/ChangeLog b/ChangeLog
index c496b2ec00..82340ee483 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Jul 14 16:38:45 2014  Eric Wong  <e@80x24.org>
+
+	* vm_core.h (struct rb_iseq_struct): reduce to 288 bytes on 64-bit
+
 Mon Jul 14 16:07:25 2014  Eric Wong  <e@80x24.org>
 
 	* iseq.h (struct iseq_catch_table_entry): shrink to 32 bytes
diff --git a/vm_core.h b/vm_core.h
index 510a4ad4cd..39dce05c99 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -228,8 +228,8 @@ struct rb_iseq_struct {
     union iseq_inline_storage_entry *is_entries;
     int is_size;
 
-    rb_call_info_t *callinfo_entries;
     int callinfo_size;
+    rb_call_info_t *callinfo_entries;
 
     /**
      * argument information