diff --git a/ChangeLog b/ChangeLog
index b8f68f6ec5..0139f6437c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Tue Sep 30 17:04:59 2008  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* test/bigdecimal/test_bigdecimal.rb (test_sqrt_bigdecimal): wrong
+	  precision specification.  a patch from TAKANO Mitsuhiro
+	  <takano32 at jus.or.jp> in [ruby-dev:36634].
+
 Tue Sep 30 16:53:55 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* parse.y (stmt): returns non zero.  [ruby-dev:36633]
diff --git a/test/bigdecimal/test_bigdecimal.rb b/test/bigdecimal/test_bigdecimal.rb
index f8d932a87a..90245db625 100644
--- a/test/bigdecimal/test_bigdecimal.rb
+++ b/test/bigdecimal/test_bigdecimal.rb
@@ -466,9 +466,9 @@ class TestBigDecimal < Test::Unit::TestCase
     x = BigDecimal.new("0.09")
     assert_in_delta(0.3, x.sqrt(1), 0.001)
     x = BigDecimal.new((2**100).to_s)
-    assert_equal(1125899906842624, x.sqrt(1))
-    assert_equal(1125899906842624, x.sqrt(2))
-    assert_equal(1125899906842624, x.sqrt(3)) # I don't understand the meaning of argument...
+    assert_equal(1125899906842624, x.sqrt(100))
+    assert_equal(1125899906842624, x.sqrt(200))
+    assert_equal(1125899906842624, x.sqrt(300)) # I don't understand the meaning of argument...
     x = BigDecimal.new("-" + (2**100).to_s)
     assert_raise(FloatDomainError) { x.sqrt(1) }
     x = BigDecimal.new((2**200).to_s)