diff --git a/sunbeam-python/sunbeam/commands/prepare_node.py b/sunbeam-python/sunbeam/commands/prepare_node.py
index 6009f3598..95f53accc 100644
--- a/sunbeam-python/sunbeam/commands/prepare_node.py
+++ b/sunbeam-python/sunbeam/commands/prepare_node.py
@@ -96,6 +96,14 @@
                     /etc/environment
     done
 fi
+
+# Ensure there is no existing/leftover multus config in /etc/cni
+# from testing amphora loadbalancer
+# These will prevent k8s starting the k8s load balancer if present
+if [[ $(sudo find /etc/cni -name '*multus*') ]]; then
+   echo 'ERROR: existing CNI config detected in /etc/cni'
+   exit 1
+fi
 """
 
 COMMON_TEMPLATE = f"""