diff --git a/samples/model-builder/experiment_tracking/log_pipeline_job_to_experiment_sample.py b/samples/model-builder/experiment_tracking/log_pipeline_job_to_experiment_sample.py
index 495f9c2581..9c1effa1bb 100644
--- a/samples/model-builder/experiment_tracking/log_pipeline_job_to_experiment_sample.py
+++ b/samples/model-builder/experiment_tracking/log_pipeline_job_to_experiment_sample.py
@@ -1,4 +1,4 @@
-# Copyright 2022 Google LLC
+# Copyright 2023 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -23,9 +23,9 @@ def log_pipeline_job_to_experiment_sample(
     pipeline_job_display_name: str,
     template_path: str,
     pipeline_root: str,
-    parameter_values: Optional[Dict[str, Any]],
     project: str,
     location: str,
+    parameter_values: Optional[Dict[str, Any]] = None,
 ):
     aiplatform.init(project=project, location=location)
 
diff --git a/samples/model-builder/experiment_tracking/log_pipeline_job_to_experiment_sample_test.py b/samples/model-builder/experiment_tracking/log_pipeline_job_to_experiment_sample_test.py
index f826d1ca1e..e365b972fd 100644
--- a/samples/model-builder/experiment_tracking/log_pipeline_job_to_experiment_sample_test.py
+++ b/samples/model-builder/experiment_tracking/log_pipeline_job_to_experiment_sample_test.py
@@ -1,4 +1,4 @@
-# Copyright 2022 Google LLC
+# Copyright 2023 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -25,9 +25,9 @@ def test_log_pipeline_job_sample(
         pipeline_job_display_name=constants.DISPLAY_NAME,
         template_path=constants.TEMPLATE_PATH,
         pipeline_root=constants.STAGING_BUCKET,
-        parameter_values=constants.PARAMS,
         project=constants.PROJECT,
         location=constants.LOCATION,
+        parameter_values=constants.PARAMS,
     )
 
     mock_sdk_init.assert_called_with(