diff --git a/src/opnsense/mvc/app/models/OPNsense/CaptivePortal/CaptivePortal.xml b/src/opnsense/mvc/app/models/OPNsense/CaptivePortal/CaptivePortal.xml
index 9f9c4131b..1ef480af4 100644
--- a/src/opnsense/mvc/app/models/OPNsense/CaptivePortal/CaptivePortal.xml
+++ b/src/opnsense/mvc/app/models/OPNsense/CaptivePortal/CaptivePortal.xml
@@ -25,6 +25,7 @@
                         <enable>/^(?!0).*$/</enable>
                         <ipaddr>/^((?!dhcp).)*$/</ipaddr>
                     </filters>
+                    <ValidationMessage>One or more interfaces must be selected</ValidationMessage>
                 </interfaces>
                 <authservers type="AuthenticationServerField">
                     <Required>N</Required>