diff --git a/sdks/python/apache_beam/io/gcp/bigquery.py b/sdks/python/apache_beam/io/gcp/bigquery.py
index a7849ad2e424..71cb1808492a 100644
--- a/sdks/python/apache_beam/io/gcp/bigquery.py
+++ b/sdks/python/apache_beam/io/gcp/bigquery.py
@@ -1921,7 +1921,7 @@ def __init__(
       load_job_project_id=None,
       max_insert_payload_size=MAX_INSERT_PAYLOAD_SIZE,
       num_streaming_keys=DEFAULT_SHARDS_PER_DESTINATION,
-      cdc_writes_with_primary_key:List[str]=None,
+      cdc_writes_with_primary_key: List[str] = None,
       expansion_service=None):
     """Initialize a WriteToBigQuery transform.
 
@@ -2531,7 +2531,7 @@ def __init__(
       use_at_least_once=False,
       with_auto_sharding=False,
       num_storage_api_streams=0,
-      cdc_writes_with_primary_key:List[str]=None,
+      cdc_writes_with_primary_key: List[str] = None,
       expansion_service=None):
     self._table = table
     self._table_side_inputs = table_side_inputs