diff --git a/src/modules/module-avb/gptp.c b/src/modules/module-avb/gptp.c
index 0b5469259..bb19bb819 100644
--- a/src/modules/module-avb/gptp.c
+++ b/src/modules/module-avb/gptp.c
@@ -110,7 +110,8 @@ static bool update_ts_refclk(struct gptp *gptp) {
 	req.management_message_length_be = htons(2);
 	req.management_id_be = htons(PTP_MGMT_ID_PARENT_DATA_SET);
 
-	if (write(gptp->ptp_fd, &req, sizeof(req)) == -1) {
+	ret = write(gptp->ptp_fd, &req, sizeof(req));
+	if (ret == -1) {
 		pw_log_warn("Failed to send PTP management request: %m");
 		if (errno != ENOTCONN)
 			return false;
@@ -120,6 +121,10 @@ static bool update_ts_refclk(struct gptp *gptp) {
 			pw_log_info("Reopened PTP management socket");
 		return false;
 	}
+	if (ret != sizeof(req)) {
+		pw_log_warn("Incomplete PTP management request: %m");
+		return false;
+	}
 
 	uint8_t buf[sizeof(struct ptp_management_msg) + sizeof(struct ptp_parent_data_set)];
 	ret = read(gptp->ptp_fd, &buf, sizeof(buf));