diff --git a/tests/test_requirements.py b/tests/test_requirements.py
index 73daec464..d40f5e872 100644
--- a/tests/test_requirements.py
+++ b/tests/test_requirements.py
@@ -1,7 +1,8 @@
+import os.path
 import textwrap
 from pip.backwardcompat import urllib
 from pip.req import Requirements
-from tests.test_pip import reset_env, run_pip, write_file, pyversion, here
+from tests.test_pip import reset_env, run_pip, write_file, pyversion, here, path_to_url
 from tests.local_repos import local_checkout
 from tests.path import Path
 
@@ -29,7 +30,7 @@ def test_relative_requirements_file():
     Test installing from a requirements file with a relative path with an egg= definition..
 
     """
-    url = 'file://' + str(urllib.quote(Path(here).abspath + '/packages/../packages/FSPkg') + '#egg=FSPkg').replace('\\', '/')
+    url = path_to_url(os.path.join(here, 'packages', '..', 'packages', 'FSPkg')) + '#egg=FSPkg'
     env = reset_env()
     write_file('file-egg-req.txt', textwrap.dedent("""\
         %s