diff --git a/type/__bird_radv/man.rst b/type/__bird_radv/man.rst
index 1448f1d..27362aa 100644
--- a/type/__bird_radv/man.rst
+++ b/type/__bird_radv/man.rst
@@ -34,6 +34,11 @@ route-preference
   This option specifies the default value of advertised route preference for
   specific routes. Default: medium.
 
+default-lifetime
+  This option specifies the time (in seconds) how long (since the receipt of RA)
+  hosts may use the router as a default router. 0 means do not use as a default
+  router. Default: 3.
+
 OPTIONAL MULTIPLE PARAMETERS
 ----------------------------
 route
diff --git a/type/__bird_radv/manifest b/type/__bird_radv/manifest
index 6c27be0..ed04028 100755
--- a/type/__bird_radv/manifest
+++ b/type/__bird_radv/manifest
@@ -73,6 +73,12 @@ then
 	ROUTE_PREFERENCE="route preference $(cat "${__object:?}/parameter/route-preference");"
 fi
 
+DEFAULT_LIFETIME=
+if [ -f "${__object:?}/parameter/default-lifetime" ];
+then
+	DEFAULT_LIFETIME="default lifetime $(cat "${__object:?}/parameter/default-lifetime");"
+fi
+
 __file "${confdir:?}/radv-${__object_id:?}.conf" \
 	--mode 0640 --owner root --group bird \
 	--source - << EOF
@@ -91,6 +97,7 @@ protocol radv ${__object_id:?} {
 
 	interface "$(cat "${__object:?}/parameter/interface")" {
 	$MTU
+	$DEFAULT_LIFETIME
 	$DEFAULT_PREFERENCE
 	$ROUTE_PREFERENCE
 	};
diff --git a/type/__bird_radv/parameter/optional b/type/__bird_radv/parameter/optional
index 87494d7..51058a7 100644
--- a/type/__bird_radv/parameter/optional
+++ b/type/__bird_radv/parameter/optional
@@ -1,3 +1,4 @@
 mtu
 default-preference
 route-preference
+default-lifetime