diff --git a/ChangeLog b/ChangeLog
index 6f0f295332..6551ac3f86 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Jul 13 23:27:12 2013  Akinori MUSHA  <knu@iDaemons.org>
+
+	* lib/fileutils.rb (FileUtils#chown, FileUtils#chown_R): If user
+	  and group are both nil, print ":".
+
 Sat Jul 13 23:16:49 2013  Tanaka Akira  <akr@fsij.org>
 
 	* bignum.c (bigrsh_bang): Fix bignum digits overrun.
diff --git a/lib/fileutils.rb b/lib/fileutils.rb
index 723ad91000..8b001cc6d7 100644
--- a/lib/fileutils.rb
+++ b/lib/fileutils.rb
@@ -1022,8 +1022,8 @@ module FileUtils
   def chown(user, group, list, options = {})
     fu_check_options options, OPT_TABLE['chown']
     list = fu_list(list)
-    fu_output_message sprintf('chown %s%s',
-                              (group ? [user,group].join(':') : user) + ' ',
+    fu_output_message sprintf('chown %s %s',
+                              (group ? "#{user}:#{group}" : user || ':'),
                               list.join(' ')) if options[:verbose]
     return if options[:noop]
     uid = fu_get_uid(user)
@@ -1051,9 +1051,9 @@ module FileUtils
   def chown_R(user, group, list, options = {})
     fu_check_options options, OPT_TABLE['chown_R']
     list = fu_list(list)
-    fu_output_message sprintf('chown -R%s %s%s',
+    fu_output_message sprintf('chown -R%s %s %s',
                               (options[:force] ? 'f' : ''),
-                              (group ? [user,group].join(':') : user) + ' ',
+                              (group ? "#{user}:#{group}" : user || ':'),
                               list.join(' ')) if options[:verbose]
     return if options[:noop]
     uid = fu_get_uid(user)
diff --git a/version.h b/version.h
index c6af636702..fd195d2791 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.0.0"
 #define RUBY_RELEASE_DATE "2013-07-13"
-#define RUBY_PATCHLEVEL 258
+#define RUBY_PATCHLEVEL 259
 
 #define RUBY_RELEASE_YEAR 2013
 #define RUBY_RELEASE_MONTH 7