diff --git a/src/tcpreplay_opts.def b/src/tcpreplay_opts.def
index e9184935..abe9868c 100644
--- a/src/tcpreplay_opts.def
+++ b/src/tcpreplay_opts.def
@@ -668,6 +668,7 @@ EOText;
 
 flag = {
     name        = pid;
+    value       = P;
     descrip     = "Print the PID of tcpreplay at startup";
     flag-code   = <<- EOPid