diff --git a/ChangeLog b/ChangeLog
index 63d32cb8d0..fe3fc22388 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Nov 24 12:47:27 2012  Hiroshi Shirosaki  <h.shirosaki@gmail.com>
+
+	* test/ruby/test_process.rb (TestProcess#test_setsid): "./ruby-trunk"
+	  doesn't work on all environments. EnvUtil.rubybin would be suitable.
+
 Sat Nov 24 12:28:04 2012  Hiroshi Shirosaki  <h.shirosaki@gmail.com>
 
 	* array.c (rb_ary_aref): fix Segmentation fault at TestArray#test_aref
diff --git a/test/ruby/test_process.rb b/test/ruby/test_process.rb
index c4427be33c..ce80beabdd 100644
--- a/test/ruby/test_process.rb
+++ b/test/ruby/test_process.rb
@@ -1562,7 +1562,7 @@ class TestProcess < Test::Unit::TestCase
     return unless Process.respond_to?(:setsid)
     return unless Process.respond_to?(:getsid)
 
-    IO.popen(["./ruby-trunk", "-e", <<EOS]) do|io|
+    IO.popen([RUBY, "-e", <<EOS]) do|io|
 	Marshal.dump(Process.getsid, STDOUT)
 	newsid = Process.setsid
 	Marshal.dump(newsid, STDOUT)