diff --git a/README.md b/README.md
index 41103be..5faa577 100644
--- a/README.md
+++ b/README.md
@@ -215,6 +215,17 @@ When initializing Raygun, pass through a `groupingKey` function.
         }
     });
 
+### Custom error objects
+
+By default Raygun4Node tries to convert unknown objects into a human readable string to help with grouping, this doens't always make sense.
+
+To disable it
+
+    var raygunClient = new raygun.Client().init({
+        apiKey: 'YOUR_KEY',
+        useHumanStringForObject: false
+    });
+
 ### Examples
 View a screencast on creating an app with Node.js and Express.js, then hooking up the error handling and sending them at [http://raygun.io/blog/2013/07/video-nodejs-error-handling-with-raygun/](http://raygun.io/blog/2013/07/video-nodejs-error-handling-with-raygun/)
 
@@ -223,6 +234,7 @@ In lieu of a formal styleguide, take care to maintain the existing coding style.
 
 ## Release History
 
+- 0.8.5 - Add ability to turn off 'humanised-object-strings'
 - 0.8.4 - Add some smarts around passing an object in to the exception parameter
 - 0.8.3 - Turn strings into errors if passed through. Log out request errors.
 - 0.8.2 - Add setTags method
diff --git a/lib/raygun.js b/lib/raygun.js
index 520a135..5c151b9 100644
--- a/lib/raygun.js
+++ b/lib/raygun.js
@@ -15,7 +15,7 @@ var MessageBuilder = require('./raygun.messageBuilder');
 var OfflineStorage = require('./raygun.offline');
 
 var Raygun = function () {
-    var _apiKey, _filters, raygun = this, _user, _version, _host, _port, _useSSL, _onBeforeSend, _offlineStorage, _isOffline, _offlineStorageOptions, _groupingKey, _tags;
+    var _apiKey, _filters, raygun = this, _user, _version, _host, _port, _useSSL, _onBeforeSend, _offlineStorage, _isOffline, _offlineStorageOptions, _groupingKey, _tags, _useHumanStringForObject;
 
     raygun.init = function (options) {
         _apiKey = options.apiKey;
@@ -29,6 +29,7 @@ var Raygun = function () {
         _isOffline = options.isOffline;
         _groupingKey = options.groupingKey;
         _tags = options.tags;
+        _useHumanStringForObject = options.useHumanStringForObject === undefined ? true : options.useHumanStringForObject;
 
         if (_isOffline) {
             _offlineStorage.init(_offlineStorageOptions);
@@ -88,7 +89,7 @@ var Raygun = function () {
             mergedTags = mergedTags.concat(tags);
         }
 
-        var builder = new MessageBuilder({filters: _filters})
+        var builder = new MessageBuilder({filters: _filters, useHumanStringForObject: _useHumanStringForObject})
             .setErrorDetails(exception)
             .setRequestDetails(request)
             .setMachineName()
diff --git a/lib/raygun.messageBuilder.js b/lib/raygun.messageBuilder.js
index e0c98a1..6e30615 100644
--- a/lib/raygun.messageBuilder.js
+++ b/lib/raygun.messageBuilder.js
@@ -52,7 +52,7 @@ var RaygunMessageBuilder = function (options) {
   this.setErrorDetails = function (error) {
     var errorType = Object.prototype.toString.call(error);
 
-    if (errorType === '[object Object]') {
+    if (errorType === '[object Object]' && options.useHumanStringForObject) {
       error = humanString(error);
       message.details.groupingKey = error.replace(/\W+/g, "").substring(0, 64);
     }
diff --git a/package.json b/package.json
index a11f2df..b22b489 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "raygun",
   "description": "Raygun.io plugin for Node",
-  "version": "0.8.4",
+  "version": "0.8.5",
   "homepage": "https://github.com/MindscapeHQ/raygun4node",
   "author": {
     "name": "MindscapeHQ",
diff --git a/test/raygun.messageBuilder_test.js b/test/raygun.messageBuilder_test.js
index 03cfdb1..1a9a286 100644
--- a/test/raygun.messageBuilder_test.js
+++ b/test/raygun.messageBuilder_test.js
@@ -45,7 +45,28 @@ test('basic builder tests', function (t) {
     tt.ok(message.details.machineName);
     tt.end();
   });
-  
+
+  t.test('humanise error string', function (tt){
+    var builder = new MessageBuilder({ useHumanStringForObject:true });
+    builder.setErrorDetails({name:'Test'});
+
+    var message = builder.build();
+    tt.ok(message.details.error.message);
+    tt.equal('name=Test', message.details.error.message);
+    tt.ok(message.details.groupingKey);
+    tt.end();
+  });
+
+  t.test('dont humanise string', function (tt){
+    var builder = new MessageBuilder({useHumanStringForObject:false});
+    builder.setErrorDetails({name:'Test'});
+
+    var message = builder.build();
+    tt.notOk(message.details.groupingKey);
+    tt.equal('NoMessage', message.details.error.message);
+    tt.end();
+  });
+
   t.end();
 });