diff --git a/ChangeLog b/ChangeLog
index e18394b5cc..bf771b640e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Apr 26 17:41:17 2013  Tanaka Akira  <akr@fsij.org>
+
+	* thread_pthread.c (ruby_init_stack): Add STACK_GROW_DIR_DETECTION.
+	  This fixes a compilation failure while cross-compiling for ARM.
+
 Fri Apr 26 14:35:00 2013  Zachary Scott  <zachary@zacharyscott.net>
 
 	* lib/rss/atom.rb: Documentation for RSS::Atom based on a patch by
diff --git a/thread_pthread.c b/thread_pthread.c
index 8953f5ece8..cae9006337 100644
--- a/thread_pthread.c
+++ b/thread_pthread.c
@@ -672,6 +672,7 @@ ruby_init_stack(volatile VALUE *addr
     /* it should be on co-routine (alternative stack). [Feature #2294] */
     {
 	void *start, *end;
+	STACK_GROW_DIR_DETECTION;
 
 	if (IS_STACK_DIR_UPPER()) {
 	    start = native_main_thread.stack_start;