diff --git a/src/etc/inc/plugins.inc.d/radvd.inc b/src/etc/inc/plugins.inc.d/radvd.inc
index 0c624d72181..c1aab9a459b 100644
--- a/src/etc/inc/plugins.inc.d/radvd.inc
+++ b/src/etc/inc/plugins.inc.d/radvd.inc
@@ -306,6 +306,9 @@ function radvd_configure_do($verbose = false, $ignorelist = [])
 
         if (!$entry->nat64prefix->isEmpty()) {
             $radvdconf .= "    nat64prefix {$entry->nat64prefix->getValue()} {\n";
+            if (!$entry->AdvValidLifetime->isEmpty()) {
+                $radvdconf .= "        AdvValidLifetime {$entry->AdvValidLifetime->getValue()};\n";
+            }
             $radvdconf .= "    };\n";
         }