diff --git a/parsons/google/google_bigquery.py b/parsons/google/google_bigquery.py
index 64b6acb6d4..2f028a8a40 100644
--- a/parsons/google/google_bigquery.py
+++ b/parsons/google/google_bigquery.py
@@ -696,7 +696,7 @@ def copy_s3(
 
         # copy from S3 to GCS
         tmp_gcs_bucket = check_env.check("GCS_TEMP_BUCKET", tmp_gcs_bucket)
-        gcs_client = gcs_client or GoogleCloudStorage()
+        gcs_client = gcs_client or GoogleCloudStorage(app_creds=self.app_creds)
         temp_blob_uri = gcs_client.copy_s3_to_gcs(
             aws_source_bucket=bucket,
             aws_access_key_id=aws_access_key_id,
@@ -809,7 +809,7 @@ def copy(
             schema.append(schema_row)
         job_config.schema = schema
 
-        gcs_client = gcs_client or GoogleCloudStorage()
+        gcs_client = gcs_client or GoogleCloudStorage(app_creds=self.app_creds)
         temp_blob_name = f"{uuid.uuid4()}.{data_type}"
         temp_blob_uri = gcs_client.upload_table(tbl, tmp_gcs_bucket, temp_blob_name)