diff --git a/ChangeLog b/ChangeLog
index 7f26f53e8c..0ac2730fcf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Sep 28 13:14:34 2012  Koichi Sasada  <ko1@atdot.net>
+
+	* vm_core.h: now VM_DEBUG_BP_CHECK should be 1.
+
 Fri Sep 28 12:51:54 2012  Koichi Sasada  <ko1@atdot.net>
 
 	* vm_core.h: remove rb_control_frame_t::bp (bp: base pointer).
diff --git a/vm_core.h b/vm_core.h
index 51af4770e1..8d5140729b 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -354,7 +354,7 @@ typedef struct rb_vm_struct {
 } rb_vm_t;
 
 #ifndef VM_DEBUG_BP_CHECK
-#define VM_DEBUG_BP_CHECK 0
+#define VM_DEBUG_BP_CHECK 1
 #endif
 
 typedef struct {