diff --git a/test/circular.js b/test/circular.js
index d0c7b44..0ec6a5f 100644
--- a/test/circular.js
+++ b/test/circular.js
@@ -2,7 +2,7 @@ var assert = require('assert');
 var Traverse = require('traverse');
 var util = require('util');
 
-exports.circular = function (assert) {
+exports.circular = function () {
     var obj = { x : 3 };
     obj.y = obj;
     var foundY = false;
diff --git a/test/instance.js b/test/instance.js
index 4531ee0..501981f 100644
--- a/test/instance.js
+++ b/test/instance.js
@@ -1,7 +1,8 @@
+var assert = require('assert');
 var Traverse = require('traverse');
 var EventEmitter = require('events').EventEmitter;
 
-exports['check instanceof on node elems'] = function (assert) {
+exports['check instanceof on node elems'] = function () {
     
     var counts = { emitter : 0 };
     
diff --git a/test/json.js b/test/json.js
index de916e7..0b067cb 100644
--- a/test/json.js
+++ b/test/json.js
@@ -1,6 +1,7 @@
+var assert = require('assert');
 var Traverse = require('traverse');
 
-exports['json test'] = function (assert) {
+exports['json test'] = function () {
     var id = 54;
     var callbacks = {};
     var obj = { moo : function () {}, foo : [2,3,4, function () {}] };
diff --git a/test/leaves.js b/test/leaves.js
index de42407..4e8d280 100644
--- a/test/leaves.js
+++ b/test/leaves.js
@@ -1,6 +1,7 @@
+var assert = require('assert');
 var Traverse = require('traverse');
 
-exports['leaves test'] = function (assert) {
+exports['leaves test'] = function () {
     var acc = [];
     Traverse({
         a : [1,2,3],
diff --git a/test/obj.js b/test/obj.js
index 6c3a19c..9c3b0db 100644
--- a/test/obj.js
+++ b/test/obj.js
@@ -1,7 +1,7 @@
 var assert = require('assert');
 var Traverse = require('traverse');
 
-exports['traverse an object with nested functions'] = function (assert) {
+exports['traverse an object with nested functions'] = function () {
     var to = setTimeout(function () {
         assert.fail('never ran');
     }, 1000);