diff --git a/test/test_IPy.py b/test/test_IPy.py
index 8dbbd97..769fd7e 100644
--- a/test/test_IPy.py
+++ b/test/test_IPy.py
@@ -785,7 +785,7 @@ def run(self):
                 self.result = default
 
     it = InterruptableThread()
-    it.setDaemon(True)
+    it.daemon = True
     it.start()
     it.join(timeout_duration)
     if hasattr(it, 'is_alive'):