diff --git a/test/test-helper.js b/test/test-helper.js
index 3a6cf8b7..8d854b81 100644
--- a/test/test-helper.js
+++ b/test/test-helper.js
@@ -96,7 +96,7 @@ assert.empty = function(actual) {
 };
 
 assert.success = function(callback) {
-  if(callback.length === 1) {
+  if(callback.length === 1 || callback.length === 0) {
     return assert.calls(function(err, arg) {
       if(err) {
         console.log(err);