diff --git a/candm.h b/candm.h
index 575f1ed..2d66997 100644
--- a/candm.h
+++ b/candm.h
@@ -262,6 +262,7 @@ typedef struct {
 #define REQ_ADDSRC_REQUIRE 0x40
 #define REQ_ADDSRC_INTERLEAVED 0x80
 #define REQ_ADDSRC_BURST 0x100
+#define REQ_ADDSRC_NTS 0x200
 
 typedef struct {
   uint32_t type;
@@ -277,6 +278,7 @@ typedef struct {
   int32_t min_samples;
   int32_t max_samples;
   uint32_t authkey;
+  uint32_t nts_port;
   Float max_delay;
   Float max_delay_ratio;
   Float max_delay_dev_ratio;
diff --git a/client.c b/client.c
index b87c1a3..de08be2 100644
--- a/client.c
+++ b/client.c
@@ -1131,6 +1131,7 @@ process_cmd_add_source(CMD_Request *msg, char *line)
       msg->data.ntp_source.min_samples = htonl(data.params.min_samples);
       msg->data.ntp_source.max_samples = htonl(data.params.max_samples);
       msg->data.ntp_source.authkey = htonl(data.params.authkey);
+      msg->data.ntp_source.nts_port = htonl(data.params.nts_port);
       msg->data.ntp_source.max_delay = UTI_FloatHostToNetwork(data.params.max_delay);
       msg->data.ntp_source.max_delay_ratio = UTI_FloatHostToNetwork(data.params.max_delay_ratio);
       msg->data.ntp_source.max_delay_dev_ratio =
@@ -1144,6 +1145,7 @@ process_cmd_add_source(CMD_Request *msg, char *line)
           (data.params.iburst ? REQ_ADDSRC_IBURST : 0) |
           (data.params.interleaved ? REQ_ADDSRC_INTERLEAVED : 0) |
           (data.params.burst ? REQ_ADDSRC_BURST : 0) |
+          (data.params.nts ? REQ_ADDSRC_NTS : 0) |
           (data.params.sel_options & SRC_SELECT_PREFER ? REQ_ADDSRC_PREFER : 0) |
           (data.params.sel_options & SRC_SELECT_NOSELECT ? REQ_ADDSRC_NOSELECT : 0) |
           (data.params.sel_options & SRC_SELECT_TRUST ? REQ_ADDSRC_TRUST : 0) |
diff --git a/cmdmon.c b/cmdmon.c
index 5e3fc55..7950e7a 100644
--- a/cmdmon.c
+++ b/cmdmon.c
@@ -723,6 +723,7 @@ handle_add_source(CMD_Request *rx_message, CMD_Reply *tx_message)
   params.max_samples = ntohl(rx_message->data.ntp_source.max_samples);
   params.filter_length = ntohl(rx_message->data.ntp_source.filter_length);
   params.authkey = ntohl(rx_message->data.ntp_source.authkey);
+  params.nts_port = ntohl(rx_message->data.ntp_source.nts_port);
   params.max_delay = UTI_FloatNetworkToHost(rx_message->data.ntp_source.max_delay);
   params.max_delay_ratio =
     UTI_FloatNetworkToHost(rx_message->data.ntp_source.max_delay_ratio);
@@ -738,13 +739,12 @@ handle_add_source(CMD_Request *rx_message, CMD_Reply *tx_message)
   params.iburst = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_IBURST ? 1 : 0;
   params.interleaved = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_INTERLEAVED ? 1 : 0;
   params.burst = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_BURST ? 1 : 0;
+  params.nts = ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_NTS ? 1 : 0;
   params.sel_options =
     (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_PREFER ? SRC_SELECT_PREFER : 0) |
     (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_NOSELECT ? SRC_SELECT_NOSELECT : 0) |
     (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_TRUST ? SRC_SELECT_TRUST : 0) |
     (ntohl(rx_message->data.ntp_source.flags) & REQ_ADDSRC_REQUIRE ? SRC_SELECT_REQUIRE : 0);
-  params.nts = 0;
-  params.nts_port = 0;
 
   status = NSR_AddSourceByName(name, port, pool, type, &params);
   switch (status) {