diff --git a/src/storage/s3.js b/src/storage/s3.js
index 81de6207b..db9c8de84 100644
--- a/src/storage/s3.js
+++ b/src/storage/s3.js
@@ -30,7 +30,8 @@ var assert = require('assert'),
     https = require('https'),
     PassThrough = require('stream').PassThrough,
     path = require('path'),
-    S3BlockReadStream = require('s3-block-read-stream');
+    S3BlockReadStream = require('s3-block-read-stream'),
+    _ = require('underscore');
 
 // test only
 var originalAWS;
@@ -429,7 +430,7 @@ function testConfig(apiConfig, callback) {
             Body: 'testcontent'
         };
 
-        var s3 = new AWS.S3(credentials);
+        var s3 = new AWS.S3(_.omit(credentials, 'retryDelayOptions', 'maxRetries'));
         s3.putObject(params, function (error) {
             if (error) return callback(new BoxError(BoxError.EXTERNAL_ERROR, error.message || error.code)); // DO sets 'code'