diff --git a/lib/formats/json/parser.js b/lib/formats/json/parser.js
index e2cd938..b914b1a 100644
--- a/lib/formats/json/parser.js
+++ b/lib/formats/json/parser.js
@@ -1,6 +1,6 @@
 var Spec02 = require("../../specs/spec_0_2.js");
 
-const spec = new Spec02();
+const spec02 = new Spec02();
 
 function JSONParser() {
 
@@ -37,7 +37,8 @@ function validate_and_parse_as_json(payload) {
  */
 function validate_spec(payload) {
 
-  spec.check(payload);
+  // is that follow spec 0.2?
+  spec02.check(payload);
 
   return payload;
 }