diff --git a/ChangeLog b/ChangeLog
index 1371874278..a51132181b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -581,6 +581,11 @@ Mon Jan 29 23:52:32 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* tool/compile.rb: replace YARVCore by VM class.
 
+Mon Jan 29 17:52:44 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* lib/date/format.rb (Date::Format::Bag::method_missing): add
+	  prefix to avoid making t class-local instance variable.
+
 Mon Jan 29 21:32:37 2007  Masaki Suketa  <masaki.suketa@nifty.ne.jp>
 
 	* ext/win32ole/win32ole.c: add WIN32OLE.locale=, WIN32OLE.locale,
diff --git a/lib/date/format.rb b/lib/date/format.rb
index 6cada0f69b..152ca2ff6b 100644
--- a/lib/date/format.rb
+++ b/lib/date/format.rb
@@ -99,7 +99,7 @@ class Date
       def method_missing(t, *args, &block)
 	t = t.to_s
 	set = t.chomp!('=')
-	t = '@' + t
+	t = '@v' + t
 	if set
 	  instance_variable_set(t, *args)
 	else