diff --git a/ChangeLog b/ChangeLog
index ccc59c916b..5ccfd0d1a8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Nov 29 09:52:08 2012  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* thread.c (do_select): suppress warning (uninitialized value warning)
+	  with UNINITIALIZED_VAR().
+
 Thu Nov 29 09:36:09 2012  Koichi Sasada  <ko1@atdot.net>
 
 	* eval.c (ruby_cleanup): delay THREAD_KILLED timing.
diff --git a/thread.c b/thread.c
index 56891bc89c..a56f264a6c 100644
--- a/thread.c
+++ b/thread.c
@@ -3180,7 +3180,8 @@ static int
 do_select(int n, rb_fdset_t *read, rb_fdset_t *write, rb_fdset_t *except,
 	  struct timeval *timeout)
 {
-    int result, lerrno;
+    int UNINITIALIZED_VAR(result);
+    int lerrno;
     rb_fdset_t UNINITIALIZED_VAR(orig_read);
     rb_fdset_t UNINITIALIZED_VAR(orig_write);
     rb_fdset_t UNINITIALIZED_VAR(orig_except);