diff --git a/test/json/json_parser_test.rb b/test/json/json_parser_test.rb
index 943d9328..a4292871 100644
--- a/test/json/json_parser_test.rb
+++ b/test/json/json_parser_test.rb
@@ -219,7 +219,9 @@ def test_parse_arrays
   def test_parse_json_primitive_values
     assert_raise(JSON::ParserError) { parse('') }
     assert_raise(TypeError) { parse(nil) }
-    assert_raise(JSON::ParserError) { parse('  /* foo */ ') }
+    EnvUtil.suppress_warning do # still no warning in JRuby verions
+      assert_raise(JSON::ParserError) { parse('  /* foo */ ') }
+    end
     assert_equal nil, parse('null')
     assert_equal false, parse('false')
     assert_equal true, parse('true')