diff --git a/ChangeLog b/ChangeLog
index 6c937543db..be50a20e94 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Fri Jul  5 19:05:40 2013  Akinori MUSHA  <knu@iDaemons.org>
+
+	* lib/fileutils.rb (FileUtils#chown, FileUtils#chown_R): Fix the
+	  wrong output message when user is nil, which should be "chown
+	  :group file" instead of "chown group file".
+
 Fri Jul  5 16:21:56 2013  Akinori MUSHA  <knu@iDaemons.org>
 
 	* test/ruby/test_regexp.rb
diff --git a/lib/fileutils.rb b/lib/fileutils.rb
index cee60892fa..806ee2544f 100644
--- a/lib/fileutils.rb
+++ b/lib/fileutils.rb
@@ -1045,7 +1045,7 @@ module FileUtils
     fu_check_options options, OPT_TABLE['chown']
     list = fu_list(list)
     fu_output_message sprintf('chown %s%s',
-                              [user,group].compact.join(':') + ' ',
+                              (group ? [user,group].join(':') : user) + ' ',
                               list.join(' ')) if options[:verbose]
     return if options[:noop]
     uid = fu_get_uid(user)
@@ -1075,7 +1075,7 @@ module FileUtils
     list = fu_list(list)
     fu_output_message sprintf('chown -R%s %s%s',
                               (options[:force] ? 'f' : ''),
-                              [user,group].compact.join(':') + ' ',
+                              (group ? [user,group].join(':') : user) + ' ',
                               list.join(' ')) if options[:verbose]
     return if options[:noop]
     uid = fu_get_uid(user)