diff --git a/ChangeLog b/ChangeLog
index 3b3789626c..150fd71f39 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Thu Jan 10 22:00:58 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* vm_core.h (VM_DEBUG_BP_CHECK): set 0 as default.
+	  This flag specifies checking BP consistency on each frame popping.
+	  Now, we don't have any trouble on it, so I remove it.
+	  If you feel any bugs about VM execution, then set it to 1.
+
 Thu Jan 10 21:03:05 2013 TAKANO `takano32' Mitsuhiro <tak@no32.tk>
 
 	* cont.c: define FIBER_USE_NATIVE as 0 in ia64.
diff --git a/vm_core.h b/vm_core.h
index f1dc013313..2e1509b373 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -419,7 +419,7 @@ typedef struct rb_vm_struct {
 #define RUBY_VM_FIBER_MACHINE_STACK_SIZE_MIN  (  16 * 1024 * sizeof(VALUE)) /*   64 KB or  128 KB */
 
 #ifndef VM_DEBUG_BP_CHECK
-#define VM_DEBUG_BP_CHECK 1
+#define VM_DEBUG_BP_CHECK 0
 #endif
 
 typedef struct rb_control_frame_struct {