diff --git a/providers/google/src/airflow/providers/google/cloud/transfers/facebook_ads_to_gcs.py b/providers/google/src/airflow/providers/google/cloud/transfers/facebook_ads_to_gcs.py
index 938c257448bb8..ea43667076651 100644
--- a/providers/google/src/airflow/providers/google/cloud/transfers/facebook_ads_to_gcs.py
+++ b/providers/google/src/airflow/providers/google/cloud/transfers/facebook_ads_to_gcs.py
@@ -208,7 +208,7 @@ def _decide_and_flush(self, converted_rows_with_action: dict[FlushAction, list])
 
     def _flush_rows(self, converted_rows: list[Any] | None, object_name: str):
         if converted_rows:
-            headers = converted_rows[0].keys()
+            headers = self.fields
             with tempfile.NamedTemporaryFile("w", suffix=".csv") as csvfile:
                 writer = csv.DictWriter(csvfile, fieldnames=headers)
                 writer.writeheader()