diff --git a/ChangeLog b/ChangeLog
index 436b705226..b72fe1babe 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,4 @@
-Tue Jun  5 13:29:12 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Tue Jun  5 13:32:04 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* compile.c, dir.c, eval.c, eval_jump.h, eval_method.h, numeric.c,
 	  pack.c, parse.y, re.c, thread.c, vm.c, vm_dump.c, call_cfunc.ci,
@@ -6,6 +6,8 @@ Tue Jun  5 13:29:12 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* call_cfunc.ci: protoized.
 
+	* thread_win32.ci: fixed typo.
+
 Tue Jun  5 13:17:11 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* call_cfunc.ci, compile.c, dir.c, eval.c, eval_jump.h, numeric.c,
diff --git a/thread_win32.ci b/thread_win32.ci
index d69cd98a01..1a0ef7d71d 100644
--- a/thread_win32.ci
+++ b/thread_win32.ci
@@ -238,7 +238,7 @@ native_mutex_unlock(rb_thread_lock_t *lock)
 int
 native_mutex_trylock(rb_thread_lock_t *lock)
 {
-#if USE_WIN32MUTEX
+#if USE_WIN32_MUTEX
     int result;
     thread_debug("native_mutex_trylock: %p\n", *lock);
     result = w32_wait_events(&*lock, 1, 1, 0);
@@ -258,7 +258,7 @@ native_mutex_trylock(rb_thread_lock_t *lock)
 void
 native_mutex_initialize(rb_thread_lock_t *lock)
 {
-#if USE_WIN32MUTEX
+#if USE_WIN32_MUTEX
     *lock = CreateMutex(NULL, FALSE, NULL);
     if (*lock == NULL) {
 	w32_error();
@@ -272,7 +272,7 @@ native_mutex_initialize(rb_thread_lock_t *lock)
 void
 native_mutex_destroy(rb_thread_lock_t *lock)
 {
-#if USE_WIN32MUTEX
+#if USE_WIN32_MUTEX
     w32_close_handle(lock);
 #else
     DeleteCriticalSection(lock);