diff --git a/ChangeLog b/ChangeLog
index 20315d07b4..0a0bbbbd4d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Jan  4 09:30:54 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* win32/Makefile.sub (TRACING_MODEL): follow yugui's previous changes.
+
 Mon Jan  4 09:30:25 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* thread_win32.c (InterlockedExchangePointer): old SDK support.
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index a27cfba707..fe7f5fae52 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -288,6 +288,7 @@ LIBRUBY_SO    = $(RUBY_SO_NAME).dll
 LIBRUBY       = $(RUBY_SO_NAME).lib
 LIBRUBYARG    = $(LIBRUBY)
 THREAD_MODEL  = win32
+TRACING_MODEL = none
 
 !if $(CROSS_COMPILING)
 PREP          = fake.rb