diff --git a/test/bigdecimal/test_bigdecimal.rb b/test/bigdecimal/test_bigdecimal.rb
index a9524bb..d75e576 100644
--- a/test/bigdecimal/test_bigdecimal.rb
+++ b/test/bigdecimal/test_bigdecimal.rb
@@ -43,6 +43,10 @@ class TestBigDecimal < Test::Unit::TestCase
                  "Expected #{x.inspect} to be negative zero")
   end
 
+  def test_not_equal
+    assert_not_equal BigDecimal("1"), BigDecimal.allocate
+  end
+
   def test_global_new
     assert_equal(1, BigDecimal("1"))
     assert_equal(1, BigDecimal("1", 1))