diff --git a/src/amplifier.c b/src/amplifier.c
index d83affa78..394ae473e 100644
--- a/src/amplifier.c
+++ b/src/amplifier.c
@@ -359,7 +359,7 @@ int HAMLIB_API amp_open(AMP *amp)
     case RIG_PORT_NETWORK:
     case RIG_PORT_UDP_NETWORK:
         /* FIXME: default port */
-        status = network_open(&rs->ampport, 4533);
+        status = network_open(&rs->ampport, 4531);
 
         if (status < 0)
         {
diff --git a/tests/ampctld.c b/tests/ampctld.c
index 86b724edd..4f64e62ab 100644
--- a/tests/ampctld.c
+++ b/tests/ampctld.c
@@ -106,7 +106,7 @@ static struct option long_options[] =
 int interactive = 1;    /* no cmd because of daemon */
 int prompt = 0 ;        /* Daemon mode for rigparse return string */
 
-const char *portno = "4533";
+const char *portno = "4531";
 const char *src_addr = NULL;    /* INADDR_ANY */
 
 char send_cmd_term = '\r';      /* send_cmd termination char */