diff --git a/ttyclock.c b/ttyclock.c
index 8fa2306..3a7122c 100644
--- a/ttyclock.c
+++ b/ttyclock.c
@@ -420,7 +420,7 @@ main(int argc, char **argv)
      /* Default delay */
      ttyclock->option.delay = 40000000; /* 25FPS */
 
-     while ((c = getopt(argc, argv, "tvsrcihfd:C:")) != -1)
+     while ((c = getopt(argc, argv, "tvsrcihf:d:C:")) != -1)
      {
           switch(c)
           {