diff --git a/lib/handler.js b/lib/handler.js
index 1df0ccb..da8afb3 100644
--- a/lib/handler.js
+++ b/lib/handler.js
@@ -235,9 +235,8 @@ Handler.prototype.saveEvaluationContext = function (context, evaluationContext)
  * @param value - desired value to be set
  */
 Handler.prototype.setBuiltinContextProperty = function(context, path, value) {
-    const result = builtInContextUtils.setProperty(JSON.parse(JSON.stringify(context.builtin)), path, value);
+    const result = builtInContextUtils.setProperty(context.builtin, path, value);
     if(result.valid) {
-        context.builtin = result.obj;
         logger.info('Successfully set built-in context property ' + path);
         return result
     } else {
@@ -253,9 +252,8 @@ Handler.prototype.setBuiltinContextProperty = function(context, path, value) {
  * @returns {{}}
  */
 Handler.prototype.deleteBuiltinContextProperty = function(context, path) {
-    const result = builtInContextUtils.deleteProperty(JSON.parse(JSON.stringify(context.builtin)), path);
+    const result = builtInContextUtils.deleteProperty(context.builtin, path);
     if(result.valid) {
-        context.builtin = result.obj;
         logger.log('Successfully deleted built-in context property ' + path);
         return result;
     } else {