diff --git a/src/el/nimbus-eth1/nimbus_launcher.star b/src/el/nimbus-eth1/nimbus_launcher.star
index 7c64b72a0..9b3b687c7 100644
--- a/src/el/nimbus-eth1/nimbus_launcher.star
+++ b/src/el/nimbus-eth1/nimbus_launcher.star
@@ -153,7 +153,7 @@ def get_config(
 
     if network_params.network not in constants.PUBLIC_NETWORKS:
         cmd.append(
-            "--custom-network="
+            "--network="
             + constants.GENESIS_CONFIG_MOUNT_PATH_ON_CONTAINER
             + "/genesis.json"
         )