diff --git a/PiCW.cpp b/PiCW.cpp
index 291ced9..5f1906b 100644
--- a/PiCW.cpp
+++ b/PiCW.cpp
@@ -532,7 +532,7 @@ void parse_commandline(
   while (1) {
     /* getopt_long stores the option index here. */
     int option_index = 0;
-    int c = getopt_long (argc, argv, "hf:w:p:s",
+    int c = getopt_long (argc, argv, "hf:w:p:sdt",
                      long_options, &option_index);
     if (c == -1)
       break;