diff --git a/dist/tools/dhcpv6-pd_ia/kea.py b/dist/tools/dhcpv6-pd_ia/kea.py
index d9bb6f1d93..7c5bad42ca 100644
--- a/dist/tools/dhcpv6-pd_ia/kea.py
+++ b/dist/tools/dhcpv6-pd_ia/kea.py
@@ -54,6 +54,7 @@ class KeaConfig(object):
                 "renew-timer": int(renew_timer),
                 "rebind-timer": int(rebind_timer),
                 "subnet6": [{
+                    "id": 1,
                     "interface": interface,
                     "subnet": "{}/{}".format(prefix, prefix_len),
                     "pd-pools": [{