diff --git a/src/etc/inc/interfaces.inc b/src/etc/inc/interfaces.inc
index 0fc368d096d..c7ddee158db 100644
--- a/src/etc/inc/interfaces.inc
+++ b/src/etc/inc/interfaces.inc
@@ -3113,17 +3113,6 @@ function DHCP6_Config_File_Advanced($interface, $wancfg, $wanif)
             $id_assoc_statement_prefix .= ";\n";
         }
 
-        if (is_numeric($wancfg['adv_dhcp6_prefix_interface_statement_sla_id'])) {
-            $id_assoc_statement_prefix .= "  prefix-interface {$wanif} {\n";
-            $id_assoc_statement_prefix .= "    sla-id {$wancfg['adv_dhcp6_prefix_interface_statement_sla_id']};\n";
-            if (($wancfg['adv_dhcp6_prefix_interface_statement_sla_len'] >= 0) &&
-                ($wancfg['adv_dhcp6_prefix_interface_statement_sla_len'] <= 128)
-            ) {
-                $id_assoc_statement_prefix .= "    sla-len {$wancfg['adv_dhcp6_prefix_interface_statement_sla_len']};\n";
-            }
-            $id_assoc_statement_prefix .= "  };\n";
-        }
-
         $iflist = link_interface_to_track6($interface);
 
         foreach ($iflist as $friendly => $ifcfg) {
diff --git a/src/opnsense/service/tests/config/config.xml b/src/opnsense/service/tests/config/config.xml
index cefcef5d40d..643af571d65 100644
--- a/src/opnsense/service/tests/config/config.xml
+++ b/src/opnsense/service/tests/config/config.xml
@@ -40,7 +40,6 @@
       <adv_dhcp6_id_assoc_statement_prefix_id/>
       <adv_dhcp6_id_assoc_statement_prefix_pltime/>
       <adv_dhcp6_id_assoc_statement_prefix_vltime/>
-      <adv_dhcp6_prefix_interface_statement_sla_id/>
       <adv_dhcp6_prefix_interface_statement_sla_len/>
       <adv_dhcp6_authentication_statement_authname/>
       <adv_dhcp6_authentication_statement_protocol/>
diff --git a/src/www/interfaces.php b/src/www/interfaces.php
index 59c95dded54..b6f6e86cb35 100644
--- a/src/www/interfaces.php
+++ b/src/www/interfaces.php
@@ -343,7 +343,7 @@ function get_wireless_channel_info($interface) {
       "adv_dhcp6_id_assoc_statement_address_pltime", "adv_dhcp6_id_assoc_statement_address_vltime",
       "adv_dhcp6_id_assoc_statement_prefix_enable", "adv_dhcp6_id_assoc_statement_prefix", "adv_dhcp6_id_assoc_statement_prefix_id",
       "adv_dhcp6_id_assoc_statement_prefix_pltime", "adv_dhcp6_id_assoc_statement_prefix_vltime",
-      "adv_dhcp6_prefix_interface_statement_sla_id", "adv_dhcp6_prefix_interface_statement_sla_len",
+      "adv_dhcp6_prefix_interface_statement_sla_len",
       "adv_dhcp6_authentication_statement_authname", "adv_dhcp6_authentication_statement_protocol", "adv_dhcp6_authentication_statement_algorithm",
       "adv_dhcp6_authentication_statement_rdm", "adv_dhcp6_key_info_statement_keyname", "adv_dhcp6_key_info_statement_realm",
       "adv_dhcp6_key_info_statement_keyid", "adv_dhcp6_key_info_statement_secret", "adv_dhcp6_key_info_statement_expire",
@@ -1110,7 +1110,6 @@ interface_sync_wireless_clones($a_interfaces[$if], false);
                     $new_config['adv_dhcp6_id_assoc_statement_prefix_id'] = $pconfig['adv_dhcp6_id_assoc_statement_prefix_id'];
                     $new_config['adv_dhcp6_id_assoc_statement_prefix_pltime'] = $pconfig['adv_dhcp6_id_assoc_statement_prefix_pltime'];
                     $new_config['adv_dhcp6_id_assoc_statement_prefix_vltime'] = $pconfig['adv_dhcp6_id_assoc_statement_prefix_vltime'];
-                    $new_config['adv_dhcp6_prefix_interface_statement_sla_id'] = $pconfig['adv_dhcp6_prefix_interface_statement_sla_id'];
                     $new_config['adv_dhcp6_prefix_interface_statement_sla_len'] = $pconfig['adv_dhcp6_prefix_interface_statement_sla_len'];
                     $new_config['adv_dhcp6_authentication_statement_authname'] = $pconfig['adv_dhcp6_authentication_statement_authname'];
                     $new_config['adv_dhcp6_authentication_statement_protocol'] = $pconfig['adv_dhcp6_authentication_statement_protocol'];
@@ -2678,8 +2677,6 @@ function toggle_allcfg() {
                           <td><i class="fa fa-info-circle text-muted"></i> <?=gettext("Prefix Interface");?></td>
                           <td>
                             <?=gettext("Prefix Interface "); ?>
-                            <i><?=gettext("Site-Level Aggregation Identifier"); ?></i>
-                            <input name="adv_dhcp6_prefix_interface_statement_sla_id" type="text" id="adv_dhcp6_prefix_interface_statement_sla_id" value="<?=$pconfig['adv_dhcp6_prefix_interface_statement_sla_id'];?>" />
                             <i><?=gettext("Site-Level Aggregation Length"); ?></i>
                             <input name="adv_dhcp6_prefix_interface_statement_sla_len" type="text" id="adv_dhcp6_prefix_interface_statement_sla_len" value="<?=$pconfig['adv_dhcp6_prefix_interface_statement_sla_len'];?>" />
                           </td>