diff --git a/tests/test_feedexport.py b/tests/test_feedexport.py
index 2b57449d9..6eefa14bf 100644
--- a/tests/test_feedexport.py
+++ b/tests/test_feedexport.py
@@ -2,11 +2,12 @@ from __future__ import absolute_import
 import os
 import csv
 import json
+import warnings
 from io import BytesIO
 import tempfile
 import shutil
-from six.moves.urllib.parse import urlparse
-import warnings
+from six.moves.urllib.parse import urljoin, urlparse
+from six.moves.urllib.request import pathname2url
 
 from zope.interface.verify import verifyObject
 from twisted.trial import unittest
@@ -226,9 +227,10 @@ class FeedExportTest(unittest.TestCase):
     def run_and_export(self, spider_cls, settings=None):
         """ Run spider with specified settings; return exported data. """
         tmpdir = tempfile.mkdtemp()
-        res_name = tmpdir + '/res'
+        res_path = os.path.join(tmpdir, 'res')
+        res_uri = urljoin('file:', pathname2url(res_path))
         defaults = {
-            'FEED_URI': 'file://' + res_name,
+            'FEED_URI': res_uri,
             'FEED_FORMAT': 'csv',
         }
         defaults.update(settings or {})
@@ -238,7 +240,7 @@ class FeedExportTest(unittest.TestCase):
                 spider_cls.start_urls = [s.url('/')]
                 yield runner.crawl(spider_cls)
 
-            with open(res_name, 'rb') as f:
+            with open(res_path, 'rb') as f:
                 defer.returnValue(f.read())
 
         finally: