diff --git a/ChangeLog b/ChangeLog
index 4a210a0825..49a79d5047 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Dec 17 11:39:39 2008  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
+
+	* test/bigdecimal/test_bigdecimal.rb (TestBigDecimal#test_hash):
+	  shut up warning.  see [ruby-dev:37437]
+
 Wed Dec 17 11:01:35 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* string.c (rb_str_hash): gets rid of collisions between differen
diff --git a/test/bigdecimal/test_bigdecimal.rb b/test/bigdecimal/test_bigdecimal.rb
index fd5b4afd91..7eecc1ade1 100644
--- a/test/bigdecimal/test_bigdecimal.rb
+++ b/test/bigdecimal/test_bigdecimal.rb
@@ -256,8 +256,8 @@ class TestBigDecimal < Test::Unit::TestCase
 
   def test_hash
     a = []
-    x = BigDecimal.new("1")
-    10.times { a << x *= 10 }
+    b = BigDecimal.new("1")
+    10.times { a << b *= 10 }
     h = {}
     a.each_with_index {|x, i| h[x] = i }
     a.each_with_index do |x, i|