diff --git a/scripts/build_retro_cost.py b/scripts/build_retro_cost.py
index a57ab81a..f5313c21 100644
--- a/scripts/build_retro_cost.py
+++ b/scripts/build_retro_cost.py
@@ -169,7 +169,7 @@ def prepare_building_stock_data():
             "Construction features (U-value)": "Construction features (U-values)",
         },
         inplace=True,
-    )     
+    )
 
     building_data.country_code = building_data.country_code.str.upper()
     building_data["subsector"].replace(