diff --git a/src/etc/inc/interfaces.inc b/src/etc/inc/interfaces.inc
index b3433d522..6459ef864 100644
--- a/src/etc/inc/interfaces.inc
+++ b/src/etc/inc/interfaces.inc
@@ -2605,7 +2605,7 @@ function interface_track6_configure($interface = 'lan', $wancfg, $linkupevent =
             break;
         case 'slaac':
             interface_track6_slaac_configure($interface, $wancfg);
-            break;
+            /* FALLTHROUGH */
         case 'dhcp6':
             if ($linkupevent == true) {
                 /*
diff --git a/src/etc/rc.newwanip b/src/etc/rc.newwanip
index 78f69515f..3fa903997 100755
--- a/src/etc/rc.newwanip
+++ b/src/etc/rc.newwanip
@@ -116,13 +116,14 @@ system_hosts_generate();
 
 if (isset($config['interfaces'][$interface]['ipaddrv6'])) {
     switch($config['interfaces'][$interface]['ipaddrv6']) {
-        case "6to4":
+        case '6to4':
             interface_6to4_configure($interface, $config['interfaces'][$interface]);
             break;
-        case "6rd":
+        case '6rd':
             interface_6rd_configure($interface, $config['interfaces'][$interface]);
             break;
-        case "dhcp6":
+        case 'dhcp6':
+        case 'slaac':
             if (isset($config['interfaces'][$interface]['dhcp6usev4iface'])) {
                 interface_dhcpv6_prepare($interface, $config['interfaces'][$interface]);
                 interface_dhcpv6_configure($interface, $config['interfaces'][$interface]);