diff --git a/clock.c b/clock.c
index 71b3899..845e27a 100644
--- a/clock.c
+++ b/clock.c
@@ -956,7 +956,7 @@ struct clock *clock_create(enum clock_type type, struct config *config,
 		interface_set_label(iface, ts_label);
 		interface_ensure_tslabel(iface);
 		interface_get_tsinfo(iface);
-		if (iface->ts_info.valid &&
+		if (interface_tsinfo_valid(iface) &&
 		    ((iface->ts_info.so_timestamping & required_modes) != required_modes)) {
 			pr_err("interface '%s' does not support requested timestamping mode",
 			       interface_name(iface));
@@ -975,7 +975,7 @@ struct clock *clock_create(enum clock_type type, struct config *config,
 		if (1 != sscanf(phc_device, "/dev/ptp%d", &phc_index)) {
 			phc_index = -1;
 		}
-	} else if (iface->ts_info.valid) {
+	} else if (interface_tsinfo_valid(iface)) {
 		phc_index = interface_phc_index(iface);
 	} else {
 		pr_err("PTP device not specified and automatic determination"
diff --git a/port.c b/port.c
index f4834ba..b590024 100644
--- a/port.c
+++ b/port.c
@@ -2511,7 +2511,7 @@ void port_link_status(void *ctx, int linkup, int ts_index)
 		interface_get_tsinfo(p->iface);
 
 		/* Only switch phc with HW time stamping mode */
-		if (p->iface->ts_info.valid &&
+		if (interface_tsinfo_valid(p->iface) &&
 		    interface_phc_index(p->iface) >= 0) {
 			required_modes = clock_required_modes(p->clock);
 			if ((p->iface->ts_info.so_timestamping & required_modes) != required_modes) {
@@ -3001,7 +3001,7 @@ struct port *port_open(const char *phc_device,
 
 	if (transport == TRANS_UDS) {
 		; /* UDS cannot have a PHC. */
-	} else if (!interface->ts_info.valid) {
+	} else if (!interface_tsinfo_valid(interface)) {
 		pr_warning("port %d: get_ts_info not supported", number);
 	} else if (phc_index >= 0 &&
 		   phc_index != interface_phc_index(interface)) {