diff --git a/third_party/python/Lib/test/test_genericpath.py b/third_party/python/Lib/test/test_genericpath.py
index 664a91631..d9be5d4dd 100644
--- a/third_party/python/Lib/test/test_genericpath.py
+++ b/third_party/python/Lib/test/test_genericpath.py
@@ -516,7 +516,7 @@ class CommonTest(GenericTest):
 class PathLikeTests(unittest.TestCase):
 
     def setUp(self):
-        self.file_name = support.TESTFN.lower()
+        self.file_name = support.TESTFN
         self.file_path = FakePath(support.TESTFN)
         self.addCleanup(support.unlink, self.file_name)
         create_file(self.file_name, b"test_genericpath.PathLikeTests")