diff --git a/test/mjsunit/json2.js b/test/mjsunit/json2.js
index f048f05..f68c76c 100644
--- a/test/mjsunit/json2.js
+++ b/test/mjsunit/json2.js
@@ -183,3 +183,8 @@
   externalizeString(str, true);
 } catch (e) { }
 TestStringify("\"external\"", str, null, 0);
+
+var o = {};
+o.somespecialproperty = 10;
+o["\x19"] = 10;
+assertThrows("JSON.parse('{\"somespecialproperty\":100, \"\x19\":10}')");