diff --git a/ripngd/ripng_main.c b/ripngd/ripng_main.c
index 5fb0444..6c33525 100644
--- a/ripngd/ripng_main.c
+++ b/ripngd/ripng_main.c
@@ -214,7 +214,7 @@
     {
       int opt;
 
-      opt = getopt_long (argc, argv, "dlf:hA:P:u:v", longopts, 0);
+      opt = getopt_long (argc, argv, "dlf:i:hA:P:u:v", longopts, 0);
     
       if (opt == EOF)
 	break;