diff --git a/iptables/templates/iptables-rules.v4.j2 b/iptables/templates/iptables-rules.v4.j2
index 37b51ba..b55e885 100644
--- a/iptables/templates/iptables-rules.v4.j2
+++ b/iptables/templates/iptables-rules.v4.j2
@@ -68,7 +68,7 @@
 {% endif %}
 {% if psql_firewall_enabled %}
 {% if psql_db_port is defined %}
-{% if psql_listen_on_ext_int %}
+{% if psql_listen_on_ext_int is defined and psql_listen_on_ext_int %}
 {% if psql_db_data is defined %}
 # postgresql clients
 {% for db in psql_db_data %}