diff --git a/ChangeLog b/ChangeLog
index 77ea2dfd7c..6b41742c93 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Feb 27 18:01:20 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* gc.c (ruby_get_stack_grow_direction): no needs to use thread
+	  here, and not initialized yet.  [ruby-core:22439]
+
 Fri Feb 27 17:45:25 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* file.c (file_load_ok): checks if regular file, except for the
diff --git a/gc.c b/gc.c
index ca24f82470..80cd62ee2d 100644
--- a/gc.c
+++ b/gc.c
@@ -1102,10 +1102,10 @@ int ruby_stack_grow_direction;
 int
 ruby_get_stack_grow_direction(VALUE *addr)
 {
-    rb_thread_t *th = GET_THREAD();
-    SET_STACK_END;
+    VALUE *end;
+    SET_MACHINE_STACK_END(&end);
 
-    if (STACK_END > addr) return ruby_stack_grow_direction = 1;
+    if (end > addr) return ruby_stack_grow_direction = 1;
     return ruby_stack_grow_direction = -1;
 }
 #endif
diff --git a/thread_pthread.c b/thread_pthread.c
index cb9511e000..91c5b42d67 100644
--- a/thread_pthread.c
+++ b/thread_pthread.c
@@ -275,7 +275,7 @@ ruby_init_stack(VALUE *addr
     native_main_thread.stack_start = STACK_END_ADDRESS;
 #else
     if (!native_main_thread.stack_start ||
-        STACK_UPPER(&addr,
+        STACK_UPPER((VALUE *)(void *)&addr,
                     native_main_thread.stack_start > addr,
                     native_main_thread.stack_start < addr)) {
         native_main_thread.stack_start = addr;