diff --git a/drivers/nfc/port100.c b/drivers/nfc/port100.c
index 3cd995de1bbb..151b220381f9 100644
--- a/drivers/nfc/port100.c
+++ b/drivers/nfc/port100.c
@@ -573,7 +573,7 @@ static void port100_tx_update_payload_len(void *_frame, int len)
 {
 	struct port100_frame *frame = _frame;
 
-	frame->datalen = cpu_to_le16(le16_to_cpu(frame->datalen) + len);
+	le16_add_cpu(&frame->datalen, len);
 }
 
 static bool port100_rx_frame_is_valid(void *_frame)