diff --git a/common/utils/T/tracer/macpdu2wireshark.c b/common/utils/T/tracer/macpdu2wireshark.c
index 7ea3b70bb40340d2305b9f39d0e0e9fdfda1b9e9..8720efd8c0834e0a75b5452b12030420f7da082c 100644
--- a/common/utils/T/tracer/macpdu2wireshark.c
+++ b/common/utils/T/tracer/macpdu2wireshark.c
@@ -289,7 +289,7 @@ void usage(void) {
     "    -max-sib <n>              report at maximum n SIBs\n"
     "    -live                     run live\n"
     "    -live-ip <IP address>     tracee's IP address (default %s)\n"
-    "    -live-port <por>          tracee's port (default %d)\n"
+    "    -live-port <port>         tracee's port (default %d)\n"
     "-i and -live are mutually exclusive options. One of them must be provided\n"
     "but not both.\n",
     DEFAULT_IP,