diff --git a/ChangeLog b/ChangeLog
index 0ccff23892c8af..895926092647ef 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Thu Jan 20 23:25:28 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* configure.in: Add '#include <stdlib.h>' to
+	  rb_cv_localtime_overflow test too. It's reported by Tomoyuki
+	  Chikanaga. Thanks.
+
 Thu Jan 20 16:11:00 2011  Kenta Murata <mrkn@mrkn.jp>
 
 	* README.EXT, README.EXT.ja: You shouldn't choose ``conftest.c'' as a
diff --git a/configure.in b/configure.in
index 3a60ddf9a8cca7..c25296639c4651 100644
--- a/configure.in
+++ b/configure.in
@@ -1485,6 +1485,7 @@ fi
 # http://www.freebsd.org/cgi/query-pr.cgi?pr=145341
 AC_CACHE_CHECK(for localtime(3) overflow correctly, rb_cv_localtime_overflow,
   [AC_TRY_RUN([
+#include <stdlib.h>
 #include <time.h>
 
 void
diff --git a/test/psych/test_json_tree.rb b/test/psych/test_json_tree.rb
index 5fcb0d6a37f953..98c4678982cfea 100644
--- a/test/psych/test_json_tree.rb
+++ b/test/psych/test_json_tree.rb
@@ -41,8 +41,8 @@ def test_list_to_json
     end
 
     def test_time
-      time = Time.new(2010, 10, 10).utc
-      assert_equal "{\"a\": \"2010-10-10 07:00:00.000000000Z\"}\n", Psych.to_json({'a' => time })
+      time = Time.utc(2010, 10, 10).utc
+      assert_equal "{\"a\": \"2010-10-10 00:00:00.000000000Z\"}\n", Psych.to_json({'a' => time })
     end
 
     def test_datetime