diff --git a/src/promptflow-evals/promptflow/evals/evaluate/_utils.py b/src/promptflow-evals/promptflow/evals/evaluate/_utils.py
index 874d476651f..fcb0a6f47b0 100644
--- a/src/promptflow-evals/promptflow/evals/evaluate/_utils.py
+++ b/src/promptflow-evals/promptflow/evals/evaluate/_utils.py
@@ -255,4 +255,4 @@ def _apply_column_mapping(source_df: pd.DataFrame, mapping_config: dict, inplace
 
 
 def _has_aggregator(evaluator):
-    return hasattr(evaluator, "__aggregate__")
\ No newline at end of file
+    return hasattr(evaluator, "__aggregate__")