diff --git a/ospf6d/ospf6_main.c b/ospf6d/ospf6_main.c
index 519cde7..1279b5b 100644
--- a/ospf6d/ospf6_main.c
+++ b/ospf6d/ospf6_main.c
@@ -254,7 +254,7 @@
   /* Command line argument treatment. */
   while (1) 
     {
-      opt = getopt_long (argc, argv, "df:hp:A:P:u:v", longopts, 0);
+      opt = getopt_long (argc, argv, "df:i:hp:A:P:u:v", longopts, 0);
     
       if (opt == EOF)
         break;