diff --git a/predict_with_excel.py b/predict_with_excel.py
index 13ec5b6..3789097 100644
--- a/predict_with_excel.py
+++ b/predict_with_excel.py
@@ -379,6 +379,8 @@ def build_prediction_dataframe(df: pd.DataFrame) -> pd.DataFrame:
     total_minutes = df_without_last["焊接工时"].sum()
     total_row["焊接工时"] = minutes_to_dhm_format(total_minutes)
 
+    df_without_last["焊接工时"] = df_without_last["焊接工时"].apply(minutes_to_dhm_format)
+
     result_df = pd.concat([df_without_last, pd.DataFrame([total_row])], ignore_index=True)
     return result_df