diff --git a/ripngd/ripng_interface.c b/ripngd/ripng_interface.c
index 5d317ee..477bfd7 100644
--- a/ripngd/ripng_interface.c
+++ b/ripngd/ripng_interface.c
@@ -331,6 +331,7 @@
 
   /* To support pseudo interface do not free interface structure.  */
   /* if_delete(ifp); */
+  ifp->ifindex = IFINDEX_INTERNAL;
 
   return 0;
 }