diff --git a/ChangeLog b/ChangeLog
index 2e7aaa0049..f1f0c477c0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Tue Sep  3 23:01:41 2013  Kouhei Sutou  <kou@cozmixng.org>
+
+	* test/rexml/parser/test_tree.rb
+	  (TestTreeParser::TestInvalid#test_unmatched_close_tag):
+	  Compute expected value from test value.
+
 Tue Sep  3 22:59:58 2013  Kouhei Sutou  <kou@cozmixng.org>
 
 	* lib/rexml/parsers/treeparser.rb (REXML::Parsers::TreeParser#parse):
diff --git a/test/rexml/parser/test_tree.rb b/test/rexml/parser/test_tree.rb
index 6754e6bb59..c1a1dbb580 100644
--- a/test/rexml/parser/test_tree.rb
+++ b/test/rexml/parser/test_tree.rb
@@ -12,7 +12,7 @@ class TestTreeParser < Test::Unit::TestCase
       assert_equal(<<-MESSAGE, exception.to_s)
 Missing end tag for 'root' (got "not-root")
 Line: 1
-Position: 17
+Position: #{xml.bytesize}
 Last 80 unconsumed characters:
       MESSAGE
     end