diff --git a/scripts/cluster_network.py b/scripts/cluster_network.py
index 0f01ec8c..876b8209 100644
--- a/scripts/cluster_network.py
+++ b/scripts/cluster_network.py
@@ -478,9 +478,10 @@ if __name__ == "__main__":
     aggregate_carriers = set(n.generators.carrier) - set(exclude_carriers)
     if snakemake.wildcards.clusters.endswith("m"):
         n_clusters = int(snakemake.wildcards.clusters[:-1])
-        aggregate_carriers = snakemake.config["electricity"].get(
-            "conventional_carriers"
+        conventional = set(
+            snakemake.config["electricity"].get("conventional_carriers", [])
         )
+        aggregate_carriers = conventional.intersection(aggregate_carriers)
     elif snakemake.wildcards.clusters == "all":
         n_clusters = len(n.buses)
     else: