diff --git a/lib/units/storage/temp.js b/lib/units/storage/temp.js
index 8556725c..f5df76bb 100644
--- a/lib/units/storage/temp.js
+++ b/lib/units/storage/temp.js
@@ -1,6 +1,7 @@
 var http = require('http')
 var util = require('util')
 var path = require('path')
+var crypto = require('crypto')
 
 var express = require('express')
 var validator = require('express-validator')
@@ -89,6 +90,10 @@ module.exports = function(options) {
     if (options.saveDir) {
       form.uploadDir = options.saveDir
     }
+    form.on('fileBegin', function(name, file) {
+      var md5 = crypto.createHash('md5')
+      file.name = md5.update(file.name).digest('hex')
+    })
     Promise.promisify(form.parse, form)(req)
       .spread(function(fields, files) {
         return Object.keys(files).map(function(field) {