diff --git a/src/modules/module-avb/gptp.c b/src/modules/module-avb/gptp.c
index 1763bab4c..2c7141833 100644
--- a/src/modules/module-avb/gptp.c
+++ b/src/modules/module-avb/gptp.c
@@ -114,11 +114,17 @@ static bool update_ts_refclk(struct gptp *gptp) {
 	}
 
 	uint8_t buf[sizeof(struct ptp_management_msg) + sizeof(struct ptp_parent_data_set)];
-	if (read(gptp->ptp_fd, &buf, sizeof(buf)) == -1) {
+	ssize_t ret = read(gptp->ptp_fd, &buf, sizeof(buf));
+	if (ret == -1) {
 		pw_log_warn("Failed to receive PTP management response: %m");
 		return false;
 	}
 
+	if (ret != sizeof(buf)) {
+		pw_log_warn("Received incomplete PTP management response: %m");
+		return false;
+	}
+
 	struct ptp_management_msg res = *(struct ptp_management_msg *)buf;
 	struct ptp_parent_data_set parent =
 		*(struct ptp_parent_data_set *)(buf + sizeof(struct ptp_management_msg));