diff --git a/scripts/prepare_sector_network.py b/scripts/prepare_sector_network.py
index 528eb32c..92d004f1 100644
--- a/scripts/prepare_sector_network.py
+++ b/scripts/prepare_sector_network.py
@@ -2883,7 +2883,9 @@ def add_industry(n, costs):
             p_set=p_set,
         )
 
-    primary_steel = get(snakemake.config["industry"]["St_primary_fraction"], investment_year)
+    primary_steel = get(
+        snakemake.config["industry"]["St_primary_fraction"], investment_year
+    )
     dri_steel = get(snakemake.config["industry"]["DRI_fraction"], investment_year)
     bof_steel = primary_steel - dri_steel