diff --git a/net/haproxy/src/opnsense/service/templates/OPNsense/HAProxy/haproxy.conf b/net/haproxy/src/opnsense/service/templates/OPNsense/HAProxy/haproxy.conf
index 489848f5f..1e15b0ac5 100644
--- a/net/haproxy/src/opnsense/service/templates/OPNsense/HAProxy/haproxy.conf
+++ b/net/haproxy/src/opnsense/service/templates/OPNsense/HAProxy/haproxy.conf
@@ -43,7 +43,12 @@
 {%         for acl in action_data.linkedAcls.split(",") %}
 {%           set acl_data = helpers.getUUID(acl) %}
 {%           set acl_enabled = '1' %}
-{%           do action_acls.append('acl_' ~ acl_data.id) %}
+{#           # first check if this ACL condition should be negated #}
+{%           if acl_data.negate|default("") == '1' %}
+{%             do action_acls.append('!acl_' ~ acl_data.id) if acl_data.negate|default("") == '1' %}
+{%           else %}
+{%             do action_acls.append('acl_' ~ acl_data.id) %}
+{%           endif %}
 {#           # check if this ACL was already defined in this scope #}
 {%           if acl_data.id in acls_seen %}
 {#  # DEBUG: ignoring duplicate ACL {{acl_data.name}} #}