diff --git a/src/opnsense/mvc/app/controllers/OPNsense/Kea/forms/dialogSubnet4.xml b/src/opnsense/mvc/app/controllers/OPNsense/Kea/forms/dialogSubnet4.xml
index 99a70d8ad..ad5c61cfd 100644
--- a/src/opnsense/mvc/app/controllers/OPNsense/Kea/forms/dialogSubnet4.xml
+++ b/src/opnsense/mvc/app/controllers/OPNsense/Kea/forms/dialogSubnet4.xml
@@ -145,4 +145,14 @@
             <visible>false</visible>
         </grid_view>
     </field>
+    <field>
+        <id>subnet4.option_data.v6_only_preferred</id>
+        <label>IPv6-only Preferred (Option 108)</label>
+        <type>text</type>
+        <help>The number of seconds for which the client should disable DHCPv4. The minimum value is 300 seconds.</help>
+        <grid_view>
+            <visible>false</visible>
+        </grid_view>
+        <advanced>true</advanced>
+    </field>
 </form>
diff --git a/src/opnsense/mvc/app/models/OPNsense/Kea/KeaDhcpv4.xml b/src/opnsense/mvc/app/models/OPNsense/Kea/KeaDhcpv4.xml
index 5d94d576d..83c935a78 100644
--- a/src/opnsense/mvc/app/models/OPNsense/Kea/KeaDhcpv4.xml
+++ b/src/opnsense/mvc/app/models/OPNsense/Kea/KeaDhcpv4.xml
@@ -101,6 +101,9 @@
                     <boot_file_name type="TextField">
                         <Mask>/^([^\n"])*$/u</Mask>
                     </boot_file_name>
+                    <v6_only_preferred type="IntegerField">
+                        <MinimumValue>300</MinimumValue>
+                    </v6_only_preferred>
                 </option_data>
                 <match-client-id type="BooleanField">
                     <Default>1</Default>