diff --git a/samcli/local/docker/lambda_debug_settings.py b/samcli/local/docker/lambda_debug_settings.py
index d12ebcafb9..a1770cfa16 100644
--- a/samcli/local/docker/lambda_debug_settings.py
+++ b/samcli/local/docker/lambda_debug_settings.py
@@ -152,7 +152,7 @@ def get_debug_settings(debug_port, debug_args_list, runtime, options):
                     "--bootstrap",
                     "/var/lang/bin/python3.8",
                     "--bootstrap-args",
-                    json.dumps(debug_args_list + ["/var/runtime/bootstrap"]),
+                    json.dumps(debug_args_list + ["/var/runtime/bootstrap.py"]),
                 ],
                 debug_env_vars={},
             ),