diff --git a/index.js b/index.js
index ea206ea..2a6057c 100644
--- a/index.js
+++ b/index.js
@@ -4,6 +4,7 @@
  */
 
 var debug = require('debug')('socket.io-parser');
+var CircularJSON = require('circular-json');
 var Emitter = require('component-emitter');
 var hasBin = require('has-binary2');
 var binary = require('./binary');
@@ -170,7 +171,7 @@ function encodeAsString(obj) {
 
   // json data
   if (null != obj.data) {
-    str += JSON.stringify(obj.data);
+    str += CircularJSON.stringify(obj.data);
   }
 
   debug('encoded %j as %s', obj, str);
@@ -327,7 +328,7 @@ function decodeString(str) {
 
 function tryParse(p, str) {
   try {
-    p.data = JSON.parse(str);
+    p.data = CircularJSON.parse(str);
   } catch(e){
     return error();
   }
diff --git a/package.json b/package.json
index 2d1284f..2146b90 100644
--- a/package.json
+++ b/package.json
@@ -12,8 +12,9 @@
     "is-buffer.js"
   ],
   "dependencies": {
-    "debug": "~2.6.4",
+    "circular-json": "^0.4.0",
     "component-emitter": "1.2.1",
+    "debug": "~2.6.4",
     "has-binary2": "~1.0.2",
     "isarray": "2.0.1"
   },