diff --git a/states/nftables/blacklist.nft.j2 b/states/nftables/blacklist.nft.j2
index 20b0690..2eaf40f 100644
--- a/states/nftables/blacklist.nft.j2
+++ b/states/nftables/blacklist.nft.j2
@@ -1,7 +1,7 @@
 ## {{ salt['pillar.get']('salt_managed', default='Salt Managed') }}
 {% set blackips = salt["bl.get_ips"]() %}
 
-{% if len(blackips) > 0 %}
+{% if blackips|length > 0 %}
 define blacklist = { {{ blackips.join(",") }} }
 {% else %}
 define blacklist = { 127.255.255.255 }