diff --git a/modules/dhcp6c/acquire-delegated-prefix.fnl b/modules/dhcp6c/acquire-delegated-prefix.fnl
index 6fc7f21..f0744df 100644
--- a/modules/dhcp6c/acquire-delegated-prefix.fnl
+++ b/modules/dhcp6c/acquire-delegated-prefix.fnl
@@ -27,6 +27,6 @@
         dir (svc.open state-directory)]
     (accumulate [addresses []
                  v (dir:events)]
-      (update-prefixes lan-device addresses (v:output "prefix") system))))
+      (update-prefixes lan-device addresses (or (v:output "prefix") []) system))))
 
 { : changes : run }
diff --git a/modules/dhcp6c/acquire-wan-address.fnl b/modules/dhcp6c/acquire-wan-address.fnl
index c1c4e6c..de6edaf 100644
--- a/modules/dhcp6c/acquire-wan-address.fnl
+++ b/modules/dhcp6c/acquire-wan-address.fnl
@@ -27,6 +27,6 @@
         dir (svc.open state-directory)]
     (accumulate [addresses []
                  v (dir:events)]
-      (update-addresses wan-device addresses (v:output "address") system))))
+      (update-addresses wan-device addresses (or (v:output "address") []) system))))
 
 { : update-addresses : deletions : run }