diff --git a/src/storage/s3.js b/src/storage/s3.js
index b19ee80b5..c05362be1 100644
--- a/src/storage/s3.js
+++ b/src/storage/s3.js
@@ -412,6 +412,9 @@ function testConfig(apiConfig, callback) {
     if (typeof apiConfig.secretAccessKey !== 'string') return callback(new BoxError(BoxError.BAD_FIELD, 'secretAccessKey must be a string', { field: 'secretAccessKey' }));
 
     if (typeof apiConfig.bucket !== 'string') return callback(new BoxError(BoxError.BAD_FIELD, 'bucket must be a string', { field: 'bucket' }));
+    // the node module seems to incorrectly accept bucket name with '/'
+    if (apiConfig.bucket.includes('/')) return callback(new BoxError(BoxError.BAD_FIELD, 'bucket name cannot contain "/"', { field: 'bucket' }));
+
     if (typeof apiConfig.prefix !== 'string') return callback(new BoxError(BoxError.BAD_FIELD, 'prefix must be a string', { field: 'prefix' }));
     if ('signatureVersion' in apiConfig && typeof apiConfig.signatureVersion !== 'string') return callback(new BoxError(BoxError.BAD_FIELD, 'signatureVersion must be a string', { field: 'signatureVersion' }));
     if ('endpoint' in apiConfig && typeof apiConfig.endpoint !== 'string') return callback(new BoxError(BoxError.BAD_FIELD, 'endpoint must be a string', { field: 'endpoint' }));