diff --git a/ChangeLog b/ChangeLog
index 6841c87abb..ca717c7b25 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+Sat Oct 30 06:32:52 2010  Tanaka Akira  <akr@fsij.org>
+
+	* test/pathname/test_pathname.rb (TestPathname#test_grpowned?): the
+	  group of the created file is inherited from the parent
+	  directory on BSDs and MacOS X.  Linux also inherit the group if
+	  the setgid bit of the directory is set.  It causes the test fail.
+	  fixed by Shota Fukumori.  [ruby-dev:42458]
+
 Sat Oct 30 05:58:54 2010  Tanaka Akira  <akr@fsij.org>
 
 	* lib/resolv.rb: retry via TCP if UDP reply is truncated.
diff --git a/test/pathname/test_pathname.rb b/test/pathname/test_pathname.rb
index 235d0fb2ee..86b85b894a 100644
--- a/test/pathname/test_pathname.rb
+++ b/test/pathname/test_pathname.rb
@@ -995,6 +995,7 @@ class TestPathname < Test::Unit::TestCase
     skip "Unix file owner test" if DOSISH
     with_tmpchdir('rubytest-pathname') {|dir|
       open("f", "w") {|f| f.write "abc" }
+      File.chown(-1, Process.gid, "f")
       assert_equal(true, Pathname("f").grpowned?)
     }
   end