--- src/wpsmon.c.orig	2016-12-21 07:56:51.000000000 +0800
+++ src/wpsmon.c	2016-12-21 08:01:59.583731228 +0800
@@ -94,10 +94,10 @@
     int source = INTERFACE, ret_val = EXIT_FAILURE;
     struct bpf_program bpf = { 0 };
     char *out_file = NULL, *last_optarg = NULL, *target = NULL, *bssid = NULL;
-    char *short_options = "i:c:n:o:b:5sfuCDhPga";
+    char *short_options = "i:c:n:o:b:5sfuCFDhPga";
     struct option long_options[] = {
-		{ "get-chipset", no_argument, NULL, 'g' },
-	{ "output-piped", no_argument, NULL, 'P' },
+        { "get-chipset", no_argument, NULL, 'g' },
+        { "output-piped", no_argument, NULL, 'P' },
         { "bssid", required_argument, NULL, 'b' },
         { "interface", required_argument, NULL, 'i' },
         { "channel", required_argument, NULL, 'c' },
@@ -105,7 +105,8 @@
         { "probes", required_argument, NULL, 'n' },
         { "daemonize", no_argument, NULL, 'D' },
         { "file", no_argument, NULL, 'f' },
-        { "announce-fcs", no_argument, NULL, 'C' }, //mod by flatr0ze
+        { 0, 0, NULL, 'C' },
+        { "announce-fcs", no_argument, NULL, 'F' }, //mod by flatr0ze
         { "5ghz", no_argument, NULL, '5' },
         { "scan", no_argument, NULL, 's' },
         { "survey", no_argument, NULL, 'u' },
@@ -164,6 +165,8 @@
                 mode = SURVEY;
                 break;
             case 'C':
+                break;
+            case 'F':
                 set_validate_fcs(1); //mod by flatr0ze
                 break;
             case 'D':
@@ -624,7 +624,7 @@
     fprintf(stderr, "\t-o, --out-file=<file>                Write data to file\n");
     fprintf(stderr, "\t-n, --probes=<num>                   Maximum number of probes to send to each AP in scan mode [%d]\n", DEFAULT_MAX_NUM_PROBES);
     fprintf(stderr, "\t-D, --daemonize                      Daemonize wash\n");
-    fprintf(stderr, "\t-C, --announce-fcs                   Ignore frame checksum errors\n"); //mod by flatr0ze
+    fprintf(stderr, "\t-F, --announce-fcs                   Do not ignore frame checksum errors\n"); //mod by flatr0ze
     fprintf(stderr, "\t-5, --5ghz                           Use 5GHz 802.11 channels\n");
     fprintf(stderr, "\t-s, --scan                           Use scan mode\n");
     fprintf(stderr, "\t-u, --survey                         Use survey mode [default]\n");