diff --git a/salt/upstream/dhcp6c.conf b/salt/upstream/dhcp6c.conf
index 34feeb8..7c1cff9 100644
--- a/salt/upstream/dhcp6c.conf
+++ b/salt/upstream/dhcp6c.conf
@@ -13,8 +13,8 @@ id-assoc pd 0 {
         sla-id 129;
         # 64 - 56
         sla-len 8;
-        # …::0/64
-        ifid 0;
+        # …::b:0/64
+        ifid 720896;
     };
 };
 id-assoc na 0 {