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diff --git a/tests/conftest.py b/tests/conftest.py
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index ec47c86..174aebf 100644
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--- a/tests/conftest.py
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+++ b/tests/conftest.py
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@@ -60,7 +60,7 @@ def serve():
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             log.debug("shutting server down")
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             server.shutdown()
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             worker.join(1)
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-            if worker.isAlive():
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+            if worker.is_alive():
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                 log.warning('worker is hanged')
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             else:
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                 log.debug("server stopped")