diff --git a/ChangeLog b/ChangeLog
index 1d348ab436..1c362eb717 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Jun 16 01:48:08 2008  Koichi Sasada  <ko1@atdot.net>
+
+	* vm_dump.c (vm_stack_dump_raw): disable verbose debug output.
+
 Mon Jun 16 01:33:08 2008  Koichi Sasada  <ko1@atdot.net>
 
 	* vm_core.h, thread.c: rename global_interpreter_lock to
diff --git a/vm_dump.c b/vm_dump.c
index 2d606b313c..7f7d84c324 100644
--- a/vm_dump.c
+++ b/vm_dump.c
@@ -142,7 +142,7 @@ control_frame_dump(rb_thread_t *th, rb_control_frame_t *cfp)
 void
 vm_stack_dump_raw(rb_thread_t *th, rb_control_frame_t *cfp)
 {
-#if 1
+#if 0
     VALUE *sp = cfp->sp, *bp = cfp->bp;
     VALUE *lfp = cfp->lfp;
     VALUE *dfp = cfp->dfp;