diff --git a/helpers/idf_helper.py b/helpers/idf_helper.py
index b7251a95..66b8d644 100644
--- a/helpers/idf_helper.py
+++ b/helpers/idf_helper.py
@@ -34,7 +34,7 @@ class IdfHelper:
 
   def add_surface(self, surface, building_name):
     wall = self._idf.newidfobject('BUILDINGSURFACE:DETAILED', Name=surface.name, Surface_Type=surface.type,
-                           Zone_Name=building_name, )
+                                    Zone_Name=building_name, )
     self._matrix_to_list(surface.points)
     wall.setcoords(IdfHelper._matrix_to_list(surface.points))