diff --git a/tests/testlib.py b/tests/testlib.py
index 762d0c6a..e0ab827d 100644
--- a/tests/testlib.py
+++ b/tests/testlib.py
@@ -343,7 +343,7 @@ class TestCase(unittest2.TestCase):
 
     def _teardown_check_zombies(self):
         try:
-            pid, status, ru = os.wait3(os.WNOHANG)
+            pid, status = os.waitpid(0, os.WNOHANG)
         except OSError:
             return  # ECHILD