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diff --git a/samcli/local/services/base_local_service.py b/samcli/local/services/base_local_service.py
index 7b1ab95895d1..76812f02e00a 100644
--- a/samcli/local/services/base_local_service.py
+++ b/samcli/local/services/base_local_service.py
@@ -56,9 +56,11 @@ class BaseLocalService:
LOG.debug("Localhost server is starting up. Multi-threading = %s", multi_threaded)
- # This environ signifies we are running a main function for Flask. This is true, since we are using it within
- # our cli and not on a production server.
- os.environ["WERKZEUG_RUN_MAIN"] = "true"
+ # Suppress flask dev server output in a forward-compatible way
+ # Source: https://github.com/cs01/gdbgui/issues/425#issuecomment-1119836533
+ import flask.cli
+
+ flask.cli.show_server_banner = lambda *args: None
self._app.run(threaded=multi_threaded, host=self.host, port=self.port)
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