diff --git a/lib/incoming_form.js b/lib/incoming_form.js
index e3c8019a..4a839012 100644
--- a/lib/incoming_form.js
+++ b/lib/incoming_form.js
@@ -26,7 +26,7 @@ function IncomingForm(opts) {
   this.maxFields = opts.maxFields || 1000;
   this.maxFieldsSize = opts.maxFieldsSize || 2 * 1024 * 1024;
   this.keepExtensions = opts.keepExtensions || false;
-  this.uploadDir = opts.uploadDir || os.tmpDir();
+  this.uploadDir = opts.uploadDir || os.tmpdir();
   this.encoding = opts.encoding || 'utf-8';
   this.headers = null;
   this.type = null;