diff --git a/Lib/test/test_uu.py b/Lib/test/test_uu.py
index 8a137216e..6b0b2f24f 100644
--- a/Lib/test/test_uu.py
+++ b/Lib/test/test_uu.py
@@ -4,7 +4,6 @@ Nick Mathewson
 """
 
 import unittest
-from test import support
 from test.support import os_helper
 
 import os
@@ -187,8 +186,9 @@ class UUStdIOTest(unittest.TestCase):
 class UUFileTest(unittest.TestCase):
 
     def setUp(self):
-        self.tmpin  = os_helper.TESTFN + "i"
-        self.tmpout = os_helper.TESTFN + "o"
+        # uu.encode() supports only ASCII file names
+        self.tmpin  = os_helper.TESTFN_ASCII + "i"
+        self.tmpout = os_helper.TESTFN_ASCII + "o"
         self.addCleanup(os_helper.unlink, self.tmpin)
         self.addCleanup(os_helper.unlink, self.tmpout)