diff --git a/net/haproxy/src/opnsense/mvc/app/models/OPNsense/HAProxy/HAProxy.xml b/net/haproxy/src/opnsense/mvc/app/models/OPNsense/HAProxy/HAProxy.xml
index d35587876..2869c09d5 100644
--- a/net/haproxy/src/opnsense/mvc/app/models/OPNsense/HAProxy/HAProxy.xml
+++ b/net/haproxy/src/opnsense/mvc/app/models/OPNsense/HAProxy/HAProxy.xml
@@ -367,7 +367,7 @@
                 <bind type="CSVListField">
                     <Required>Y</Required>
                     <multiple>Y</multiple>
-                    <mask>/^((([0-9a-zA-Z._\-\*:]+:[0-9]+(-[0-9]+)?)([,]){0,1}))*/u</mask>
+                    <mask>/^((([0-9a-zA-Z._\-\*:\[\]]+:[0-9]+(-[0-9]+)?)([,]){0,1}))*/u</mask>
                     <ChangeCase>lower</ChangeCase>
                     <ValidationMessage>Please provide a valid listen address, i.e. 127.0.0.1:8080 or www.example.com:443. Port range as start-end, i.e. 127.0.0.1:1220-1240.</ValidationMessage>
                 </bind>