diff --git a/Lib/test/test_signal.py b/Lib/test/test_signal.py
index fa06729..7483f64 100644
--- a/Lib/test/test_signal.py
+++ b/Lib/test/test_signal.py
@@ -230,7 +230,7 @@
 class WakeupFDTests(unittest.TestCase):
 
     def test_invalid_fd(self):
-        fd = support.make_bad_fd()
+        fd = test_support.make_bad_fd()
         self.assertRaises(ValueError, signal.set_wakeup_fd, fd)