diff --git a/lib/formats/json/parser.js b/lib/formats/json/parser.js
index b914b1a..115b6ae 100644
--- a/lib/formats/json/parser.js
+++ b/lib/formats/json/parser.js
@@ -2,8 +2,8 @@ var Spec02 = require("../../specs/spec_0_2.js");
 
 const spec02 = new Spec02();
 
-function JSONParser() {
-
+function JSONParser(_spec) {
+  this.spec = (_spec) ? _spec : new Spec02();
 }
 
 /**
@@ -35,10 +35,10 @@ function validate_and_parse_as_json(payload) {
 /*
  * Level 1 of validation: is that follow a spec?
  */
-function validate_spec(payload) {
+function validate_spec(payload, spec) {
 
-  // is that follow spec 0.2?
-  spec02.check(payload);
+  // is that follow the spec?
+  spec.check(payload);
 
   return payload;
 }
@@ -49,7 +49,7 @@ JSONParser.prototype.parse = function(payload) {
   var valid0 = validate_and_parse_as_json(payload);
 
   // Level 1 of validation: is that follow a spec?
-  var valid1 = validate_spec(valid0);
+  var valid1 = validate_spec(valid0, this.spec);
 
   return valid1;
 }
diff --git a/test/formats/json/parser_test.js b/test/formats/json/parser_test.js
index 8619988..41b6e75 100644
--- a/test/formats/json/parser_test.js
+++ b/test/formats/json/parser_test.js
@@ -97,7 +97,7 @@ describe("JSON Event Format Parser", () => {
         .data(data)
         .toString();
 
-    var parser = new Parser();
+    var parser = new Parser(new Cloudevent.specs["0.2"]());
 
     // act
     var actual = parser.parse(payload);