diff --git a/test/json/json_generator_test.rb b/test/json/json_generator_test.rb
index d7c4173e..d5f6ac64 100755
--- a/test/json/json_generator_test.rb
+++ b/test/json/json_generator_test.rb
@@ -39,14 +39,6 @@ def setup
     JSON
   end
 
-  def silence
-    v = $VERBOSE
-    $VERBOSE = nil
-    yield
-  ensure
-    $VERBOSE = v
-  end
-
   def test_generate
     json = generate(@hash)
     assert_equal(parse(@json2), parse(json))
diff --git a/test/json/json_parser_test.rb b/test/json/json_parser_test.rb
index 1b875422..54a6bbbd 100644
--- a/test/json/json_parser_test.rb
+++ b/test/json/json_parser_test.rb
@@ -138,7 +138,8 @@ def test_parse_bignum
 
     bignum = Integer('1234567890' * 50)
     assert_equal(bignum, JSON.parse(bignum.to_s))
-    assert_equal(bignum.to_f, JSON.parse(bignum.to_s + ".0"))
+    bignum_float = EnvUtil.suppress_warning { bignum.to_f }
+    assert_equal(bignum_float, EnvUtil.suppress_warning { JSON.parse(bignum.to_s + ".0") })
   end
 
   def test_parse_bigdecimals