diff --git a/repos/kaleido/py/kaleido/scopes/base.py b/repos/kaleido/py/kaleido/scopes/base.py
index 2c4fae44..b1c588e9 100644
--- a/repos/kaleido/py/kaleido/scopes/base.py
+++ b/repos/kaleido/py/kaleido/scopes/base.py
@@ -185,7 +185,7 @@ def _ensure_kaleido(self):
                     # Set up thread to asynchronously collect standard error stream
                     if self._std_error_thread is None or not self._std_error_thread.is_alive():
                         self._std_error_thread = Thread(target=self._collect_standard_error)
-                        self._std_error_thread.setDaemon(True)
+                        self._std_error_thread.daemon = True
                         self._std_error_thread.start()
 
                     # Read startup message and check for errors