diff --git a/scripts/prepare_sector_network.py b/scripts/prepare_sector_network.py
index 0368397e..0d359e0d 100755
--- a/scripts/prepare_sector_network.py
+++ b/scripts/prepare_sector_network.py
@@ -3240,7 +3240,7 @@ def add_industry(n, costs):
             p_set=p_set,
         )
 
-    if (industrial_demand["coke"].sum() + industrial_demand["coal"].sum()) != 0:
+    if industrial_demand[["coke", "coal"]].sum().sum() > 0:
         add_carrier_buses(n, "coal")
 
         mwh_coal_per_mwh_coke = 1.366  # from eurostat energy balance