diff --git a/scripts/prepare_sector_network.py b/scripts/prepare_sector_network.py
index cc04bcbb..47aeec50 100644
--- a/scripts/prepare_sector_network.py
+++ b/scripts/prepare_sector_network.py
@@ -1567,13 +1567,13 @@ def add_land_transport(n, costs):
 
         if "oil" not in n.generators.carrier.unique():
             n.madd(
-            "Generator",
-            spatial.oil.nodes,
-            bus=spatial.oil.nodes,
-            p_nom_extendable=True,
-            carrier="oil",
-            marginal_cost=costs.at["oil", "fuel"],
-        )
+                "Generator",
+                spatial.oil.nodes,
+                bus=spatial.oil.nodes,
+                p_nom_extendable=True,
+                carrier="oil",
+                marginal_cost=costs.at["oil", "fuel"],
+            )
 
         ice_efficiency = options["transport_internal_combustion_efficiency"]